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Preferred stock warrants | 9 Months Ended
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Sep. 30, 2021
Preferred stock warrants |
Preferred stock warrants | 11. Preferred stock warrants In connection with the 2020 Term Loan, the Company issued 1,195,652 warrants to purchase shares of Series C1 Preferred Stock at an exercise price of $1.15 per share. The Company’s warrants were immediately exercisable and expire 10 years after issuance. The fair value of the warrants on the issuance date was $0.7 million. The Company also has outstanding warrants to purchase shares of Preferred Stock issued in connection with previous financing agreements. In connection with the IPO, preferred stock warrants were automatically converted to Class A common stock warrants. The Company determined the event resulted in equity classification of the Class A common stock warrants and reclassified the fair value of the preferred stock warrant liability as of the IPO date into equity. As of December 31, 2020, warrants to purchase the following classes of preferred stock outstanding consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020
​ | ​ | ​ | ​ | Series of | ​ | ​ | ​ | Preferred | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | redeemable | ​ | ​ | ​ | shares | ​ | Weighted | ​ | ​ | ​
​ | ​ | Contractual | ​ | convertible | ​ | ​ | ​ | issuable upon | ​ | average | ​ | ​ | ​
​ | ​ | term | ​ | preferred | ​ | Balance sheet | ​ | exercise | ​ | exercise | ​ | Warrant fair
Issuance date |  | (in years) |  | stock |  | classification |  | of warrant |  | price |  | value
April 24, 2017 |  | 10 |  | Series A1 |  | Liability |  | 3,823,524 | ​ | $ | 0.01 | ​ | $ | 1,875
April 12, 2018 |  | 10 |  | Series B1 |  | Liability |  | 1,199,994 | ​ | $ | 0.01 | ​ |  | 1,501
May 14, 2020 |  | 10 |  | Series C1 |  | Liability |  | 1,195,652 | ​ | $ | 1.15 | ​ |  | 741
​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 6,219,170 | ​ | ​ | ​ | ​ | $ | 4,117
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