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Redeemable Convertible Preferred Stock and Stockholders’ Equity (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Equity [Abstract] |  |
Key Inputs Used in the Fair Value Calculation of Share Purchase Option |  | The following table represents the key inputs used in the fair value calculation as of the date of exercise (February 20, 2019):
Risk free interest rate | 2.50 | %
Time to exit (in years) | 3
Expected volatility | 40.90 | %
Expected dividend yield | 0.00 | %
Fair value of Share Purchase Option (per share) | $ | 2.87 |
Common Stock Reserved For Future Issuance | As of September 30, 2021, the Company had reserved the following shares of common stock for future issuance:
Options outstanding | 7,064,945 |
Options reserved for future issuance | 12,730,521 |
Restricted stock outstanding | 156,852 |
Restricted stock units | 164,487 |
Total authorized shares of common stock reserved for future issuance | 20,116,805 |
| As of December 31, 2020, the Company had reserved the following shares of common stock for future issuance:
Conversion of Series A Preferred Stock | 10,138,200 |
Conversion of Series A-1 Preferred Stock | 5,512,800 |
Conversion of Series B Preferred Stock | 14,044,200 |
Options reserved for future issuance | 1,938,321 |
Options outstanding | 7,611,258 |
Restricted stock outstanding | 156,852 |
Total authorized shares of common stock reserved for future issuance | 39,401,631 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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