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Duolingo
(NASDAQ:DUOL) 

DUOL stock logo

Duolingo, Inc. develops a language-learning website and mobile app in the United States and China. The company offers courses in 40 different languages, including Spanish, French, Japanese, German, Korean, Italian, Chinese, Hindi, Russian, Arabic, Turkish, Portuguese, and others. It also provides a ...

Founded: 2011
IPO Price: $101 (Jul 28, 2021)
Full Time Employees: 600 (Dec 2022)
Founder: Luis von Ahn / Severin Hacker 
CEO: Luis von Ahn  
Sector: Technology
Industry: Software—Application

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At a glance:
  • Revenue Growth Driven by Paid Subscriptions: Duolingo’s top-line growth is primarily fueled by expanding paid subscriber adoption and continued monetization improvements across its language-learning platform.
  • Product-Led Engagement Supports Retention and Expansion: High daily engagement, gamified learning loops, and frequent feature iterations help sustain retention and increase the likelihood of free users converting to paid plans.
  • AI and Personalization as a Differentiator: Investments in AI-enabled personalization and premium offerings aim to improve learning outcomes and justify higher-priced tiers, supporting ARPU expansion over time.
  • Margin Leverage Potential with Scale: As the subscriber base scales, Duolingo has the potential to expand operating margins through relatively fixed platform costs and more efficient user acquisition over time.
  • Key Risks: Competition, Platform Dependence, and Content Costs: Competitive education apps, reliance on mobile app store ecosystems, and ongoing costs to develop and maintain high-quality content and features remain key watch items.
Bull Thesis:
  • Strong User Growth and Engagement: Duolingo consistently demonstrates robust growth in Daily Active Users (DAUs) and Monthly Active Users (MAUs), indicating a widening global reach and effective user acquisition strategies. High engagement rates, driven by gamification and continuous content updates, contribute to strong retention and network effects.
  • Expanding Monetization & Subscriber Base: The company continues to successfully convert free users into paying subscribers for Duolingo Plus and Max. New premium features, such as AI-powered explanations and roleplay, enhance the value proposition, driving higher conversion rates and increasing the overall subscriber count, which provides a stable recurring revenue stream.
  • Market Leadership & Brand Moat: Duolingo holds a dominant position in the digital language learning market, backed by strong brand recognition and a highly recognizable mascot. This market leadership creates a significant competitive moat, making it difficult for new entrants to challenge its scale, user base, and data advantage.
  • AI-driven Product Innovation: Duolingo is actively integrating advanced AI into its platform, exemplified by Duolingo Max. This innovation allows for more personalized learning experiences, dynamic content generation, and interactive features, which can further enhance user engagement, learning effectiveness, and differentiate the product from competitors.
Bear Thesis:
  • Path to Consistent Profitability & Free Cash Flow: Despite strong revenue growth, Duolingo has historically struggled with consistent GAAP profitability and positive free cash flow. Continued high investments in marketing, research & development, and user acquisition may pressure margins and delay sustained profitability, raising concerns about long-term financial efficiency.
  • Intense Competition & Churn Risk: The language learning market is highly competitive, with numerous apps (e.g., Babbel, Memrise, Busuu), traditional methods, and free online resources vying for users' attention. This intense competition could lead to higher customer acquisition costs, increased churn rates, and pressure on pricing power.
  • Potential for Subscriber Growth Deceleration: While overall user growth remains strong, the rate of paid subscriber growth could decelerate as the company penetrates more mature markets or reaches a saturation point among its most likely paying users. Sustaining high conversion rates from free to paid users may become increasingly challenging over time.
  • ARPU Ceiling & Monetization Challenges: There might be a ceiling to the Average Revenue Per User (ARPU) that Duolingo can achieve without alienating its large free user base or facing significant pushback on subscription prices. Expanding monetization beyond current subscription tiers and advertising could prove difficult, limiting future revenue per user growth.
Main Competitors:
  • Babbel (Babbel Language Learning App), Babbel is a direct competitor offering a subscription-based language learning app. It competes by focusing on practical conversation skills, grammar, and cultural context, often targeting adult learners with a more structured, curriculum-driven approach compared to Duolingo's gamified, bite-sized lessons.
  • Memrise (Memrise Language Learning App), Memrise competes by emphasizing vocabulary acquisition and retention through spaced repetition and user-generated content, including real-world video clips of native speakers. While also gamified, its core strength lies in its unique 'learn with locals' videos and focus on practical phrases and words.
  • Rosetta Stone (Rosetta Stone Language Learning Software), Rosetta Stone is a long-standing competitor known for its immersive learning approach, teaching languages without translation. It competes by offering a premium, comprehensive learning experience that aims for deeper understanding and fluency, often at a higher price point than Duolingo's paid tiers.
  • Pimsleur (Pimsleur Language Programs), Pimsleur competes with an audio-based learning system that focuses on core vocabulary and phrases through spaced repetition and active recall. It targets learners who prefer an auditory approach and want to develop conversational fluency quickly, often for use while commuting or multitasking, a different learning modality than Duolingo's visual app.
  • italki (italki (Language Tutoring Platform)), italki represents a different but related competitive angle by connecting language learners with human tutors for one-on-one lessons. It competes by offering personalized instruction, real-time conversation practice, and cultural exchange that app-based learning alone cannot fully replicate, appealing to learners seeking human interaction and tailored feedback.
Moat:
Duolingo's primary moat lies in its highly effective gamification, free-to-use model, and strong brand recognition, which have allowed it to amass a massive global user base. Competitors like Babbel, Memrise, Rosetta Stone, and Pimsleur often differentiate themselves through specific pedagogical approaches (e.g., immersion, audio-first, practical conversation), target audiences (e.g., adults, specific fluency goals), or premium features, typically operating on a subscription-only model. Platforms like italki compete by offering human-led interaction and personalized learning, addressing a need that app-based solutions struggle to fulfill. Duolingo's challenge is to convert its vast free user base into paying subscribers while continuously improving its efficacy and depth of learning to compete with more specialized or human-centric alternatives.
Income Statements:
Quarterly
Annual
    Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 
                      
      revenues
    271,713,000 252,265,000 230,743,000 209,550,000 192,594,000 178,327,000 167,553,000 150,985,000 137,624,000 126,839,000 115,661,000 103,824,000 96,065,000 88,386,000 81,220,000 73,014,000 63,595,000 58,803,000 
      yoy
    41.08% 41.46% 37.71% 38.79% 39.94% 40.59% 44.87% 45.42% 43.26% 43.51% 42.40% 42.20% 51.06% 50.31%     
      qoq
    7.71% 9.33% 10.11% 8.80% 8.00% 6.43% 10.97% 9.71% 8.50% 9.66% 11.40% 8.08% 8.69% 8.82% 11.24% 14.81% 8.15%  
      cost of revenues
    74,802,000 69,684,000 66,647,000 58,925,000 52,180,000 47,349,000 45,191,000 40,571,000 36,254,000 33,788,000 31,492,000 27,770,000 26,302,000 23,869,000 21,490,000 19,952,000 18,078,000 16,137,000 
      gross profit
    196,911,000 182,581,000 164,096,000 150,625,000 140,414,000 130,978,000 122,362,000 110,414,000 101,370,000 93,051,000 84,169,000 76,054,000 69,763,000 64,517,000 59,730,000 53,062,000 45,517,000 42,666,000 
      yoy
    40.24% 39.40% 34.11% 36.42% 38.52% 40.76% 45.38% 45.18% 45.31% 44.23% 40.92% 43.33% 53.27% 51.21%     
      qoq
    7.85% 11.26% 8.94% 7.27% 7.20% 7.04% 10.82% 8.92% 8.94% 10.55% 10.67% 9.02% 8.13% 8.01% 12.57% 16.58% 6.68%  
      gross margin %
    72.47% 72.38% 71.12% 71.88% 72.91% 73.45% 73.03% 73.13% 73.66% 73.36% 72.77% 73.25% 72.62% 72.99% 73.54% 72.67% 71.57% 72.56% 
      operating expenses:
                      
      research and development
    82,707,000 73,670,000 70,390,000 66,395,000 62,878,000 55,147,000 50,878,000 50,256,000 50,305,000 47,947,000 45,844,000 44,470,000 41,976,000 34,217,000 29,781,000 30,019,000 29,345,000 21,940,000 
      sales and marketing
    35,081,000 29,563,000 26,662,000 24,815,000 25,574,000 20,174,000 19,931,000 19,118,000 22,335,000 17,734,000 16,601,000 19,029,000 17,721,000 15,277,000 14,940,000 14,511,000 15,267,000 9,619,000 
      general and administrative
    43,964,000 45,985,000 43,450,000 45,533,000 38,388,000 36,957,000 35,114,000 36,245,000 33,400,000 32,235,000 30,243,000 30,707,000 30,228,000 30,057,000 26,856,000 25,947,000 29,605,000 11,585,000 
      total operating expenses
    161,752,000 149,218,000 140,502,000 136,743,000 126,840,000 112,278,000 105,923,000 105,619,000 106,040,000 97,916,000 92,688,000 94,206,000 89,925,000 79,551,000 71,577,000 70,477,000 74,217,000 43,144,000 
      income from operations
    35,159,000 33,363,000 23,594,000 13,882,000 13,574,000 18,700,000 16,439,000 4,795,000 -4,670,000 -4,865,000 -8,519,000 -18,152,000 -20,162,000 -15,034,000 -11,847,000 -17,415,000 -28,700,000 -478,000 
      yoy
    159.02% 78.41% 43.52% 189.51% -390.66% -484.38% -292.97% -126.42% -76.84% -67.64% -28.09% 4.23% -29.75% 3045.19%     
      qoq
    5.38% 41.40% 69.96% 2.27% -27.41% 13.75% 242.84% -202.68% -4.01% -42.89% -53.07% -9.97% 34.11% 26.90% -31.97% -39.32% 5904.18%  
      operating margin %
    12.94% 13.23% 10.23% 6.62% 7.05% 10.49% 9.81% 3.18% -3.39% -3.84% -7.37% -17.48% -20.99% -17.01% -14.59% -23.85% -45.13% -0.81% 
      other income
    -503,000 1,660,000 1,001,000 2,026,000 569,000  -621,000    182,000 -1,490,000 1,770,000 130,000  10,750 -219,000 303,000 
      income before interest income and income taxes
    34,656,000 35,023,000 24,595,000 11,655,000 14,143,000 17,993,000 15,818,000            
      interest income
    11,793,000 11,427,000 10,415,000 10,697,000 11,246,000 10,721,000 10,033,000 9,284,000 8,625,000 7,543,000 5,639,000        
      income before income taxes
    46,449,000 46,450,000 35,010,000 22,352,000 25,389,000 28,714,000 25,851,000 15,133,000 2,932,000 2,410,000         
      provision for income taxes
    -245,746,000 1,669,000  8,445,000 2,029,000 4,363,000  3,016,000 125,000 -1,315,000 -116,000 716,000 53,000 141,000 28,000 108,000 51,000 1,000 
      net income and comprehensive income
    292,195,000 44,781,000 35,135,000 13,907,000 23,360,000 24,351,000 26,956,000 12,117,000 2,807,000 3,725,000        -176,000 
      yoy
    1150.83% 83.90% 30.34% 14.77% 732.21% 553.72%             
      qoq
    552.50% 27.45% 152.64% -40.47% -4.07% -9.66% 122.46% 331.67% -24.64%          
      net income margin %
    107.54% 17.75% 15.23% 6.64% 12.13% 13.66% 16.09% 8.03% 2.04% 2.94% 0% 0% 0% 0% 0% 0% 0% -0.30% 
      net income per share
    6.36 0.98 0.78 0.31 0.53 0.56 0.63 0.29 0.07 0.09 -0.06 -0.35 -0.46 -0.38 -0.31 -0.28 -0.98  
      benefit from income taxes
      -125,000    -1,105,000            
      other expense, net of other income
         -707,000  -277,250 -1,023,000 -268,000     -279,000    
      loss before interest income and income taxes
           5,849,000 -5,693,000 -5,133,000         
      loss before interest income and provision for income taxes
              -8,337,000        
      income before provision for income taxes
              -2,698,000 -13,214,000 -18,392,000 -14,904,000 -12,126,000 -17,409,000 -28,919,000 -175,000 
      net loss and comprehensive loss
              -2,582,000 -13,930,000 -18,445,000 -15,045,000 -12,154,000 -17,517,000 -28,970,000  
      basic loss per common share
                     -10 
      diluted loss per common share
                     -10 
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 
                        
        assets
                        
        current assets
                        
        cash and cash equivalents
      1,011,542,000 976,231,000 883,996,000 785,791,000 854,409,000 888,240,000 829,713,000 747,610,000 701,737,000 678,665,000 641,091,000 608,180,000 599,967,000 591,160,000 577,331,000 553,922,000 549,440,000 114,636,000 
        short-term investments
      109,912,000 121,652,000 115,284,000 91,854,000 26,354,000              
        accounts receivable
      124,489,000 112,919,000 114,183,000 128,923,000 94,215,000 77,722,000 76,421,000 88,975,000 61,711,000 53,406,000 52,509,000 46,728,000 30,197,000 28,209,000 28,573,000 33,163,000 20,737,000 25,129,000 
        deferred cost of revenues
      94,570,000 93,794,000 89,564,000 80,162,000 67,329,000 63,285,000 60,397,000 53,931,000 46,124,000 42,720,000 40,137,000 35,041,000 30,258,000 29,218,000 27,780,000 24,219,000 19,726,000 17,168,000 
        income tax receivable
      9,886,000         2,363,000         
        prepaid expenses and other current assets
      16,706,000 19,394,000 16,630,000 14,858,000 16,130,000 12,317,000 10,747,000 7,282,000 9,533,000 7,787,000 7,497,000 7,234,000 7,909,000 6,563,000 6,951,000 7,967,000 6,441,000 5,635,000 
        total current assets
      1,367,105,000 1,323,990,000 1,219,657,000 1,101,588,000 1,058,437,000 1,041,564,000 977,278,000 897,798,000 819,105,000 784,941,000 741,234,000 697,183,000 668,331,000 655,150,000 640,635,000 619,271,000 596,344,000 162,568,000 
        operating lease right-of-use assets
      79,266,000 80,987,000 46,369,000 47,495,000 48,624,000 49,760,000 49,785,000 19,103,000 19,901,000 20,976,000 21,779,000 22,508,000 23,150,000 24,511,000 27,093,000 28,369,000 8,231,000 6,805,000 
        long-term investments
      98,735,000 75,362,000 83,342,000 98,292,000 55,328,000              
        intangible assets
      27,968,000 19,924,000 18,872,000 19,899,000 21,900,000 20,586,000 18,595,000 15,995,000 13,766,000 10,396,000 8,475,000 8,497,000       
        property and equipment
      24,626,000 19,685,000 19,161,000 18,943,000 19,495,000 18,343,000 13,209,000 11,792,000 12,008,000 12,571,000 12,842,000 12,969,000 13,191,000 13,356,000 10,254,000 8,211,000 8,010,000 7,692,000 
        goodwill
      35,335,000 10,538,000 10,538,000 10,538,000 10,538,000 4,050,000 4,050,000 4,050,000 4,050,000 4,050,000 4,050,000 4,050,000       
        restricted cash
      2,735,000 2,735,000 2,735,000 2,735,000 2,735,000 2,735,000 2,735,000 2,735,000           
        deferred tax assets
      240,172,000 675,000 675,000 675,000 835,000 835,000 766,000 766,000 633,000 633,000 633,000 633,000 418,000 418,000     
        other assets
      9,696,000 8,663,000 1,797,000 1,563,000 1,657,000 1,570,000 2,249,000 1,718,000 1,251,000 1,236,000 1,366,000 1,507,000 1,591,000 1,206,000 1,041,000 894,000 1,008,000 897,000 
        total assets
      1,885,638,000 1,542,559,000 1,403,146,000 1,301,728,000 1,219,549,000 1,139,443,000 1,068,667,000 953,957,000 870,714,000 834,803,000 790,379,000 747,347,000 713,699,000 701,050,000 684,511,000 661,311,000 617,777,000 181,693,000 
        liabilities and stockholders’ equity
                        
        current liabilities
                        
        deferred revenues
      441,728,000 431,177,000 415,023,000 372,884,000 310,603,000 291,477,000 279,313,000 249,192,000 208,888,000 192,753,000 181,942,000 157,550,000 134,944,000 128,194,000 119,101,000 98,267,000 80,460,000 70,997,000 
        accounts payable
      3,568,000 7,729,000 2,546,000 6,381,000 3,649,000 3,405,000 2,625,000 2,447,000 2,712,000 2,305,000 986,000 1,177,000 3,363,000 1,504,000 2,018,000 7,818,000 8,708,000 4,266,000 
        income tax payable
      16,000 24,000 6,381,000 6,591,000 36,000 38,000 362,000 792,000 55,000 62,000 925,000 1,069,000 145,000 92,000 138,000 113,000 25,000 9,000 
        accrued expenses and other current liabilities
      39,228,000 32,453,000 30,535,000 36,375,000 27,845,000 22,804,000 21,422,000 24,931,000 23,279,000 21,986,000 18,960,000 21,970,000 17,178,000 17,536,000 14,518,000 12,933,000 9,452,000 9,779,000 
        total current liabilities
      484,540,000 471,383,000 454,485,000 422,231,000 342,133,000 317,724,000 303,722,000 277,362,000 234,934,000 217,106,000 202,813,000 181,766,000 155,630,000 147,326,000 135,775,000 119,131,000 98,645,000 85,051,000 
        long-term obligation under operating leases
      93,257,000 93,843,000 54,533,000 54,656,000 54,651,000 54,775,000 53,893,000 21,094,000 20,961,000 21,292,000 22,378,000 23,503,000 24,243,000 25,505,000 28,022,000 29,124,000   
        deferred tax liabilities
      302,000 302,000 302,000 291,000 312,000              
        total liabilities
      578,099,000 565,528,000 509,320,000 477,178,000 397,096,000 372,499,000 357,615,000 298,456,000 255,895,000 238,398,000 225,191,000 205,269,000 179,873,000 172,831,000 163,797,000 148,255,000 107,046,000 92,861,000 
        commitments and contingencies
                        
        stockholders’ equity
                        
        class a common stock, 0.0001 par value...
      5,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000 4,000       
        additional paid-in capital
      1,061,270,000 1,022,958,000 984,534,000 950,393,000 962,203,000 930,054,000 898,513,000 869,918,000 841,353,000 825,746,000 798,254,000 772,562,000 750,380,000 726,328,000 703,778,000 683,966,000 664,124,000 30,649,000 
        retained earnings
      246,264,000                  
        total stockholders’ equity
      1,307,539,000 977,031,000 893,826,000 824,550,000 822,453,000 766,944,000 711,052,000 655,501,000 614,819,000 596,405,000 565,188,000 542,078,000 533,826,000 528,219,000 520,714,000 513,056,000 510,731,000  
        total liabilities and stockholders' equity
      1,885,638,000 1,542,559,000 1,403,146,000 1,301,728,000 1,219,549,000 1,139,443,000 1,068,667,000 953,957,000 870,714,000 834,803,000 790,379,000        
        accumulated deficit
       -45,931,000 -90,712,000 -125,847,000 -139,754,000 -163,114,000 -187,465,000 -214,421,000 -226,538,000 -229,345,000 -233,070,000 -230,488,000 -216,558,000 -198,113,000 -183,068,000 -170,914,000 -153,397,000 -124,427,000 
        liabilities, convertible preferred stock and stockholders’ equity
                        
        total liabilities, convertible preferred stock and stockholders' equity
                 747,347,000 713,699,000 701,050,000 684,511,000 661,311,000 617,777,000  
        capitalized software
                  7,018,000 6,409,000 5,488,000 4,566,000 4,184,000 3,731,000 
        common stock, 0.0001 par value...
                  4,000 4,000 4,000 4,000 4,000 1,000 
        convertible preferred stock, 0.0001 par value...
                       182,609,000 
        long term obligation under operating leases
                      8,401,000 7,810,000 
        liabilities, convertible preferred stock and stockholders’ deficit
                        
        stockholders’ deficit
                        
        total stockholders’ deficit
                       -93,777,000 
        total liabilities, convertible preferred stock and stockholders' deficit
                       181,693,000 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 
                         
          cash flows from operating activities:
                         
          net income
        292,195,000 44,781,000 35,135,000 13,907,000 23,360,000 24,351,000 26,956,000 12,117,000 2,807,000         
          adjustments to reconcile net income to net cash from operating activities:
                         
          deferred income taxes
                         
          stock-based compensation expense
        35,565,000 34,592,000 31,018,000 29,787,000 28,959,000 26,746,000 24,985,000 25,002,000 25,432,000 23,714,000 21,073,000 20,632,000 20,488,000 18,114,000 14,586,000 14,684,000 20,662,000 
          depreciation and amortization
        3,553,000 3,440,000 3,590,000 3,661,000 2,876,000 2,243,000 2,074,000 2,042,000 1,657,000 1,634,000 1,762,000 1,444,000 1,482,000 1,170,000 774,000 757,000 733,000 
          accretion on marketable securities
        -441,000 -467,000 -550,000 -539,000              
          changes in assets and liabilities:
                         
          deferred revenue
        10,551,000 16,154,000 42,139,000 62,281,000 19,126,000 12,164,000 30,121,000 40,304,000 16,135,000 10,811,000 24,392,000 22,606,000 6,750,000 9,093,000 20,834,000 17,807,000 9,463,000 
          accounts receivable
        -11,570,000 1,264,000 14,740,000 -34,708,000 -16,462,000 -1,301,000 12,554,000 -27,264,000 -8,305,000 -897,000 -5,781,000 -16,531,000 -1,988,000 364,000 4,590,000 -12,426,000 4,392,000 
          deferred cost of revenues
        -776,000 -4,230,000 -9,402,000 -12,833,000 -4,044,000 -2,888,000 -6,466,000 -7,807,000 -3,404,000 -2,583,000 -5,096,000 -4,783,000 -1,040,000 -1,438,000 -3,561,000 -4,493,000  
          prepaid expenses and other current assets
        -7,198,000 -2,764,000 -1,772,000 1,272,000 -3,807,000 -1,570,000 -3,465,000 2,251,000 617,000 -2,653,000 -263,000 739,000 -1,416,000 -804,000 66,000 -1,489,000 -3,406,000 
          accounts payable
        -3,406,000 4,436,000 -3,843,000 3,412,000 -214,000 1,134,000 -398,000 -142,000 344,000 1,404,000 -345,000 -2,791,000 2,450,000 -514,000 -5,800,000 -890,000 4,442,000 
          accrued expenses and other current liabilities
        5,160,000 -4,146,000 -6,204,000 15,499,000 5,550,000 315,000 -4,514,000 3,259,000 1,221,000 2,165,000 -3,201,000 4,451,000 764,000 2,240,000 1,265,000 3,299,000 700,000 
          noncurrent assets and liabilities
        92,000 -2,385,000 780,000 1,367,000 935,000 1,194,000 1,667,000 -585,000 729,000 -153,000 -255,000 -229,000 -286,000 -518,000 27,000 700,000 -947,000 
          net cash from operating activities
        84,239,000 90,675,000 105,631,000 83,344,000 56,267,000 62,388,000 83,514,000 49,193,000 37,650,000 37,167,000 29,604,000 11,608,000 8,759,000 12,662,000 20,627,000 432,000 4,511,000 
          capital expenditures
        -6,883,000 -4,351,000 -2,619,000 -2,440,000 -5,023,000 -8,656,000 -5,021,000 -4,148,000 -4,753,000 -3,371,000 -1,412,000 -895,000 -3,516,000 -3,269,000 -2,444,000 -1,108,000 -1,202,000 
          free cash flows
        77,356,000 86,324,000 103,012,000 80,904,000 51,244,000 53,732,000 78,493,000 45,045,000 32,897,000 33,796,000 28,192,000 10,713,000 5,243,000 9,393,000 18,183,000 -676,000 3,309,000 
          cash flows from investing activities:
                         
          purchases of investments
        -50,799,000 -21,715,000 -26,606,000 -111,630,000              
          maturities of investments
        39,607,000 23,794,000 18,676,000               
          capitalized software expense and purchases of intangible assets
        -2,021,000 -3,153,000 -1,310,000 -479,000 -1,845,000 -3,093,000 -3,607,000 -3,224,000 -3,994,000 -2,544,000 -731,000 -603,000 -1,437,000 -1,405,000 -1,117,000 -585,000 -379,000 
          purchase of property and equipment
        -4,862,000 -1,198,000 -1,309,000 -1,961,000 -3,178,000 -5,563,000 -1,414,000 -924,000 -759,000 -827,000 -681,000 -292,000 -2,079,000 -1,864,000 -1,327,000 -523,000 -1,085,000 
          payment of earn-out related to a previous acquisition
                         
          acquisitions of companies, net of 0 cash acquired
                         
          net cash from investing activities
        -51,675,000 -2,272,000 -10,549,000 -110,365,000 -93,288,000 -8,656,000 -5,021,000 -4,148,000 -4,753,000 -3,371,000 -1,312,000 -4,945,000 -3,516,000 -3,269,000 -2,444,000 -1,108,000 -1,464,000 
          cash flows from financing activities:
                         
          proceeds from exercise of stock options
        2,747,000 3,832,000 3,123,000 7,761,000 3,190,000 4,795,000 3,610,000 3,563,000 1,657,000 3,778,000 4,619,000 1,550,000 3,564,000 4,436,000 5,226,000 5,158,000 4,015,000 
          net cash from financing activities
        2,747,000 3,832,000 3,123,000 -41,597,000 3,190,000 4,795,000 3,610,000 3,563,000 -9,825,000 3,778,000 4,619,000 1,550,000 3,564,000 4,436,000 5,226,000 5,158,000 431,757,000 
          net increase in cash and cash equivalents
        35,311,000 92,235,000 98,205,000 -68,618,000 -33,831,000 58,527,000 82,103,000 48,608,000 23,072,000 37,574,000 32,911,000 8,213,000 8,807,000 13,829,000 23,409,000 4,482,000 434,804,000 
          cash and cash equivalents - beginning of period
        788,526,000 750,345,000 608,180,000 553,922,000 
          cash and cash equivalents - end of period
        35,311,000 92,235,000 886,731,000 -68,618,000 -33,831,000 58,527,000 832,448,000 48,608,000 23,072,000 37,574,000 641,091,000 8,213,000 8,807,000 13,829,000 577,331,000 4,482,000 434,804,000 
          gain on sale of capitalized software
               -100,000       
          loss on disposal of leasehold improvements
               16,000          
          impairment of capitalized software
                         
          proceeds from sale of capitalized software
               100,000       
          acquisitions of companies, net of 5 cash acquired
                         
          taxes paid related to net-share settlement of share-based compensation awards
                         
          acquisition of companies, net of 5 cash acquired
                         
          acquisition, net of 0 cash acquired
                         
          issuance of common stock in connection with the initial public offering, net of underwriting discounts and issuance costs
                        
          net proceeds from issuance of convertible preferred stock
                         
          repurchases of stock options
                       
          repurchase of common stock
                       
          taxes paid related to net-share settlements of share-based compensation awards
                         
          net loss
                  -2,582,000 -13,930,000 -18,445,000 -15,045,000 -12,154,000 -17,517,000 -28,970,000 
          adjustments to reconcile net loss to net cash from operating activities:
                         
          supplemental disclosure of cash flow information:
                         
          cash paid for interest
                         
          cash paid for income taxes
                    605,000 3,000 38,000 36,000 
          supplemental disclosure of noncash operating activities:
                         
          implementation costs for cloud computing included in current liabilities
                     -146,000 153,000   
          supplemental disclosure of noncash investing activities:
                         
          capitalized software included in current liabilities
                    -4,000 -2,000 14,000   
          property and equipment included in current liabilities
                    -1,013,000 880,000 178,000   
          landlord incentives included in prepaid expenses and other current assets
                    1,046,000 1,102,000   
          payments of deferred offering costs
                         
          supplemental disclosure of noncash financing activities:
                         
          deferred offering costs included in accrued expenses
                         
          changes in assets and liabilities
                         
          implementation costs for cloud computing included in accrued expenses
                         
          capitalized software included in accrued expenses
                        262,000 
          property and equipment included in accrued expenses
                        -224,000 
          deferred cost of revenue