Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Schedule of Warrants (Details)

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Capital Structure - Schedule of Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Feb. 29, 2020
Warrant Fair Value            
Change in fair value of warrant liability $ (27) $ 14,533 $ 28,108 $ 14,363    
Total warrant fair value $ 1,481   $ 1,481     $ 336
Warrants to Purchase Common Stock            
Number of Warrants            
Outstanding at Beginning of period (in shares)     610,202      
Exercise of warrants (in shares)     (69,232)      
Issued in connection with the Business Combination as common stock - charged to APIC (in shares)     (540,970)      
Outstanding at end of period (in shares)         610,202  
Warrant Fair Value            
Outstanding at Beginning of Period     $ 2,270      
Exercise of warrants     (489)      
Change in fair value of warrant liability     3,102      
Issued in connection with the Business Combination as common stock - charged to APIC     $ (4,883)      
Outstanding at end of Period         $ 2,270  
Weighted Average Exercise Price            
Outstanding at beginning of period (in dollars per share)     $ 0.27      
Exercise of warrants (in dollars per share)     $ 0.27      
Outstanding at end of period (in dollars per share)         $ 0.27  
Weighted Average Remaining Life            
Outstanding         3 years 7 months 6 days  
Warrants to purchase Series C preferred stock            
Number of Warrants            
Outstanding at Beginning of period (in shares)     5,938,193      
Exercise of warrants (in shares)     (1,756,526)      
Issued in connection with the Business Combination as common stock - charged to APIC (in shares)     (4,181,667)      
Outstanding at end of period (in shares)         5,938,193  
Warrant Fair Value            
Outstanding at Beginning of Period     $ 18,885      
Exercise of warrants     (10,968)      
Change in fair value of warrant liability     24,779      
Issued in connection with the Business Combination as common stock - charged to APIC     $ (32,696)      
Outstanding at end of Period         $ 18,885  
Weighted Average Exercise Price            
Outstanding at beginning of period (in dollars per share)     $ 1.76      
Exercise of warrants (in dollars per share)     $ 1.76      
Outstanding at end of period (in dollars per share)         $ 1.76  
Weighted Average Remaining Life            
Outstanding         2 years 7 months 6 days  
Private warrants assumed through Business Combination            
Number of Warrants            
Warrants assumed (in shares)     670,108      
Outstanding at end of period (in shares) 670,108   670,108      
Warrant Fair Value            
Warrants assumed     $ 1,253      
Change in fair value of warrant liability     228      
Outstanding at end of Period $ 1,481   $ 1,481      
Weighted Average Exercise Price            
Warrants assumed (in dollars per share)     $ 11.50      
Outstanding at end of period (in dollars per share) $ 11.50   $ 11.50      
Weighted Average Remaining Life            
Warrants assumed     5 years      
Outstanding     4 years 7 months 6 days