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