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Stockholders' Equity - (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 16, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted term |  |  |  |  | 10 years |  |  |
Share-based compensation costs | $ 503 | $ 327 | $ 850 | $ 988 | $ 1,189 | $ 2,813 | $ 5,020 |
2015 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | 12,803,162 |  | 12,803,162 |  | 5,034,459 | 5,014,300 |  |
Common shares, shares outstanding | 5,081,771 |  | 5,081,771 |  | 5,034,459 | 5,014,300 |  |
Common shares, shares authorized (in shares) | 500,000,000 |  | 500,000,000 |  | 500,000,000 | 500,000,000 |  |
Class B Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | 27,391,338 |  | 27,391,338 |  | 34,362,554 | 34,152,328 |  |
Common shares, shares outstanding | 27,143,111 |  | 27,143,111 |  | 34,114,327 | 33,904,101 |  |
Common shares, shares authorized (in shares) | 500,000,000 |  | 500,000,000 |  | 500,000,000 | 500,000,000 |  |
Class C Common stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) | 21,170,037 |  | 21,170,037 |  | 0 | 0 |  |
Common shares, shares outstanding | 21,170,037 |  | 21,170,037 |  | 0 | 0 |  |
Common shares, shares authorized (in shares) | 25,000,000 |  | 25,000,000 |  | 25,000,000 | 25,000,000 |  |
Stock option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation costs |  |  | $ 2,600 |  | $ 10,500 |  |  |
Weighted-average remaining requisite service period |  |  | 3 years |  | 2 months 12 days |  |  |
Weighted average fair value of stock options granted |  |  |  |  | $ 1.03 | $ 1.01 | $ 1.26 |
Intrinsic value of stock options exercised |  |  |  |  | $ 400 | $ 1,600 | $ 2,000 |
Stock option | 2015 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  | 16,895,765 |  |  |
Number of shares available for future issuance |  |  |  |  | 17,327,629 | 14,266,318 | 14,000,528 | 15,700,000

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