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Summary of Significant Accounting Policies (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |
Reconciliation of Cash, Equivalents and Restricted Cash |  | The following table is a reconciliation of cash, cash equivalents, and restricted cash included in the accompanying consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying consolidated statements of cash flows.
| December 31, 2019 |  | December 31, 2020
Cash and cash equivalents | $ | 37,435 |  |  | $ | 35,531 |
Restricted cash included in “other assets” and “prepaid expenses and other current assets”, respectively | 88 |  |  | 88 |
| $ | 37,523 |  |  | $ | 35,619 |
Reconciliation of Cash, Equivalents and Restricted Cash | The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows for the nine months ended September 30, 2021 and 2020.
| September 30, 2021 |  | September 30, 2020
Cash and cash equivalents | $ | 188,510 |  |  | $ | 32,712 |
Restricted cash included in “other long-term assets” | 176 |  |  | 88 |
Total cash, cash equivalents and restricted cash, at end of period | $ | 188,686 |  |  | $ | 32,800 |
| The following table is a reconciliation of cash, cash equivalents, and restricted cash included in the accompanying consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying consolidated statements of cash flows.
| December 31, 2019 |  | December 31, 2020
Cash and cash equivalents | $ | 37,435 |  |  | $ | 35,531 |
Restricted cash included in “other assets” and “prepaid expenses and other current assets”, respectively | 88 |  |  | 88 |
| $ | 37,523 |  |  | $ | 35,619 |
Schedule of Property and Equipment | The estimated useful lives of the Company’s property and equipment are as follows:
| Estimated Useful Life
| (In Years)
Computer equipment | 2 to 5
Furniture and office equipment | 5 to 7
Leasehold improvements | 2 to 4
Property and equipment consists of the following (in thousands):
| As of
| September 30, 2021 |  | December 31, 2020
Computer equipment | $ | 4,152 |  |  | $ | 3,513 |
Furniture and office equipment | 1,398 |  |  | 1,041 |
Leasehold improvements | 1,029 |  |  | 667 |
Capital leases | 5,750 |  |  | — |
Total property and equipment | 12,329 |  |  | 5,221 |
Less: accumulated depreciation and amortization | (3,938) |  |  | (2,253) |
Property and equipment, net | $ | 8,391 |  |  | $ | 2,968 |
| Property and equipment consists of the following:
| As of December 31,
| 2019 |  | 2020
Computer equipment | $ | 2,305 |  |  | $ | 3,513 |
Furniture and office equipment | 688 |  |  | 1,041 |
Leasehold improvements | 97 |  |  | 667 |
Total property and equipment | 3,090 |  |  | 5,221 |
Less: accumulated depreciation and amortization | (1,485) |  |  | (2,253) |
Property and equipment, net | $ | 1,605 |  |  | $ | 2,968 |
Rollforward of Fair Value Measurements of Share Purchase Option |  | A rollforward of the fair value measurements of the Share Purchase Option for the year end December 31, 2019, is as follows:
Balance as of January 1, 2019 | $ | 4,367 |
Change in fair value included in other expense | 903 |
Reclassification to stockholders’ deficit upon exercise | (5,270) |
Balance as of December 31, 2019 | $ | — |
Schedule of Potentially Dilutive Common Stock Equivalents | The following potentially dilutive common stock equivalents have been excluded from the calculation of diluted weighted-average shares outstanding for the three and nine months ended September 30, 2021 and 2020:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Stock options outstanding | 6,500,908 |  |  | 6,223,290 |  |  | 19,503 |  |  | 6,300,903 |
Shares of Preferred Stock | — |  |  | 29,695,200 |  |  | — |  |  | 29,695,200 |
Unvested RSAs and RSUs | 140,793 |  |  | — |  |  | 23,723 |  |  | — |
| 6,641,701 |  |  | 35,918,490 |  |  | 43,226 |  |  | 35,996,103 |
| The following potentially dilutive common stock equivalents have been excluded from the calculation of diluted weighted-average shares outstanding for the period presented:
| Year ended December 31,
| 2019 |  | 2020
Stock options outstanding | 5,693,100 |  |  | 7,611,258 |
Shares of Preferred Stock | 29,695,200 |  |  | 29,695,200 |
Restricted stock outstanding | — |  |  | 156,852 |
Schedule of Earnings Per Share, Basic and Diluted | The following table presents a reconciliation of the weighted-average shares outstanding used in the calculation of basic and diluted net income (loss) per share:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Weighted-average shares outstanding: |  |  |  |  |  |  |  |
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders—basic |  | 135,673,000 |  |  | 94,834,000 |  |  | 122,595,000 |  |  | 94,722,000 |
Dilutive effect of share equivalents resulting from stock options |  | — |  |  | — |  |  | 6,417,000 |  |  | — |
Dilutive effect of share equivalents resulting from RSAs and RSUs |  | — |  |  | — |  |  | 164,000 |  |  | — |
Dilutive effect of shares issuable upon conversion of preferred stock |  | — |  |  | — |  |  | 9,463,000 |  |  | — |
Weighted-average number of shares of common stock used in computing net income (loss) per share attributable to common stockholders—diluted |  | 135,673,000 |  |  | 94,834,000 |  |  | 138,639,000 |  |  | 94,722,000 |

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