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Warrants (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) shares | Oct. 31, 2019 seriesOfWarrant | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Jul. 15, 2021 USD ($) $ / shares shares | Dec. 31, 2020 shares | Mar. 31, 2020 shares | Dec. 31, 2016 employee
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of series of warrants issued | seriesOfWarrant |  | 3 |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 0 | $ 4,362 |  |  |  |
Warrants | Level 3 |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Fair value of warrants | $ 1,100 |  |  |  |  |  |  |  |
Warrant Exchange Promissory Notes | Notes payable |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Principal outstanding | $ 5,600 |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 3,200 |  | $ 4,400 |  |  |  |
Warrants Exchanged For Common Stock |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of shares issued and sold | shares | 21,900,000 |  |  |  |  |  |  |  |
Canada Consulting Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Class of warrant or right, exercisable (in shares) | shares |  |  |  |  |  | 200,000 |  |  |
Expected milestone payment |  |  |  |  |  | $ 3,000 |  |  |
Initial exercise price (in USD per share) | $ / shares |  |  |  |  |  | $ 6.36 |  |  |
Series A Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) | shares |  |  |  |  |  |  |  | 8,800,000 |
Fair value of consideration transferred to settle warrants | $ 13,600 |  |  |  |  |  |  |  |
Consideration transferred, common stock | 8,600 |  |  |  |  |  |  |  |
Consideration transferred, warrant exchange promissory notes | 5,000 |  |  |  |  |  |  |  |
Fair value of consideration transferred to settle warrants in excess of fair value of warrants | $ 12,500 |  |  |  |  |  |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) | shares |  |  |  |  |  |  |  | 1,000 |
Series C Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) | shares |  |  |  |  |  |  |  | 1,000 |
SPA Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Number of warrants outstanding (in shares) | shares | 0 |  |  |  |  |  |  |  |
OpCo Warrants |  |  |  |  |  |  |  |  |
Class of Warrant or Right |  |  |  |  |  |  |  |  |
Class of warrant or right, exercisable (in shares) | shares |  |  |  | 800,000 |  |  | 900,000 |  |
Initial exercise price (in USD per share) | $ / shares |  |  |  | $ 4.97 |  |  |  |  |
Number of former employees with warrants | employee |  |  |  |  |  |  |  |  | 2

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