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Stockholders' Equity - Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Nov. 08, 2019
Warrants            
Warrants outstanding 3,871,557     3,871,557   12,666,666
Common stock for each warrant exercised           1
Warrant exercisable price           $ 11.50
Warrants exercised in cashless transaction, number exercised       184,870 0  
Shares issued in cashless exercise of warrants (in shares)       87,553    
Warrant liability, beginning       $ 57,764 $ 113,905  
Change in fair value of warrant liability (note 10) $ 1,364   $ (16,737) (17,145) (57,359)  
Reclassification of warrant liability to equity for exercised warrants (1,608) $ (495)   (2,103)    
Warrant liability, ending $ 38,516   $ 56,546 $ 38,516 $ 56,546