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Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 188,510,000 | $ 32,712,000 | $ 188,510,000 | $ 32,712,000 | $ 35,531,000 | $ 37,435,000
Prepaid expenses and other current assets | 6,574,000 |  | 6,574,000 |  | 2,649,000 | 2,491,000
Accounts payable | 5,196,000 |  | 5,196,000 |  | 8,654,000 | 6,818,000
Accrued expenses | 22,285,000 |  | 22,285,000 |  | 7,719,000 | 4,112,000
Increase in deferred revenue |  |  | 9,634,000 | 3,825,000 | 6,914,000 | 7,646,000
Increase in deferred revenue, net |  |  |  |  | 6,994,000 |
Revenue recognized that was included in deferred revenue at the beginning of each period | $ 18,504,000 | 11,672,000 | $ 22,874,000 | 17,343,000 | $ 19,218,000 | 11,525,000
Amortization period of deferred contract costs | 24 months |  | 24 months |  | 24 months |
Restricted cash | $ 176,000 | 88,000 | $ 176,000 | 88,000 | $ 88,000 | 88,000
Capitalized internal-use software asset balance | 2,111,000 |  | 2,111,000 |  | 2,231,000 | 408,000
Deferred offering costs, IPO | 0 |  | 0 |  | 1,839,000 | 0
Deferred offering costs, credit facility | 473,000 |  | 473,000 |  | 630,000 | 0
Money market funds | 21,727,000 |  | 21,727,000 |  | $ 29,369,000 | 31,060,000
Share Purchase Option, expiration period |  |  |  |  | 2 years |
Advertising expense |  |  |  |  | $ 17,997,000 | 25,467,000
Foreign currency exchange loss | 57,000 | 26,000 | $ 66,000 | 296,000 | 672,000 | 733,000
Liability for uncertain tax positions |  |  |  |  | $ 0 | 0
Number of operating segments | segment |  |  | 1 |  | 1 |
Credit Facility |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Deferred offering costs, credit facility |  |  |  |  | $ 754,000 |
IPO |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Deferred offering costs, IPO |  |  |  |  | $ 1,716,000 |
Software development |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Intangible assets amortization period |  |  |  |  | 3 years |
Capitalized software development costs | 170,000 | 292,000 | $ 441,000 | 895,000 | $ 1,032,000 | 162,000
Amortization expense associated with capitalized development costs | 123,000 | $ 75,000 | 382,000 | $ 179,000 | 305,000 | 182,000
Capitalized internal-use software asset balance | 1,093,000 |  | 1,093,000 |  | 1,038,000 | 408,000
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | (88,000)
Prepaid expenses and other current assets |  |  |  |  |  | 88,000
Accounts payable |  |  |  |  |  | 888,000
Accrued expenses |  |  |  |  |  | 888,000
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 |  |  |  |  |  | $ 1,437,000
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 |  |  |  |  | $ 1,280,000 |
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 | $ 1,081,000 |  | $ 1,081,000 |  |  |
Remaining performance obligation, expected timing of satisfaction | 12 months |  | 12 months |  |  |

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