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Summary of Significant Accounting Policies - Additional Information (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) reportingUnit segment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Restricted cash included in other assets | $ 436,000 | $ 434,000 | $ 430,000
Allowance for credit losses for available-for-sale investment securities | 0 |  |
Impairment losses for goodwill | 0 | 0 | 0
Impairment charges related to the identified long-lived assets | 0 | 0 | 0
Deferred revenue recognized during the period | $ 4,500,000 | 3,400,000 |
Amortization period of deferred cost | 3 years |  |
Deferred costs | $ 10,300,000 | 9,500,000 |
Deferred costs, current | 5,500,000 | 4,800,000 |
Deferred costs, noncurrent | 4,800,000 | 4,600,000 |
Amortization expense | 5,800,000 | 4,200,000 | 2,000,000.0
Advertising expense | $ 7,000,000.0 | $ 5,800,000 | $ 4,500,000
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Subscription agreement term | 1 month |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Subscription agreement term | 1 year |  |
Unvested restricted stock units |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Vesting period | 4 years |  |
Performance shares |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Shares excluded from net loss per share attributable to common stockholders (in shares) | shares | 79 | 187 | 358
Capitalized software development costs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful lives (in years) | 3 years |  |
Goodwill |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of reporting units | reportingUnit | 1 |  |

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