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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) vote | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) vote shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) vote | Dec. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Increase in deferred revenue |  |  | $ 9,634 | $ 3,825 | $ 6,914 | $ 7,646
Revenue recognized that was included in deferred revenue at the beginning of each period | $ 18,504 | $ 11,672 | $ 22,874 | 17,343 | $ 19,218 | 11,525
Amortization period of deferred contract costs | 24 months |  | 24 months |  | 24 months |
Restricted cash | $ 176 | 88 | $ 176 | 88 | $ 88 | 88
Money market funds | 21,727 |  | 21,727 |  | 29,369 | 31,060
Foreign currency exchange loss | $ (57) | $ (26) | $ (66) | $ (296) | $ (672) | (733)
Allocable basis to compute net income (loss) per share | shares |  |  | 1 |  |  |
Common Class A |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Number of votes per share of stock held | vote | 1 |  | 1 |  | 1 |
Number of shares issued in conversion (in shares) | shares |  |  | 1 |  |  |
Common Class B |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Number of votes per share of stock held | vote | 10 |  | 10 |  |  |
Number of shares issued in conversion (in shares) | shares |  |  | 1 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Aggregate amount of transaction price |  |  |  |  |  | $ 1,437
Remaining performance obligation, expected timing of satisfaction |  |  |  |  |  | 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Aggregate amount of transaction price |  |  |  |  | $ 1,280 |
Remaining performance obligation, expected timing of satisfaction |  |  |  |  | 12 months |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Aggregate amount of transaction price | $ 1,081 |  | $ 1,081 |  |  |
Remaining performance obligation, expected timing of satisfaction | 12 months |  | 12 months |  |  |

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