Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

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Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Feb. 28, 2019
Sep. 30, 2021
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock 1,938,096     14,325,000     14,325,000  
Issuance of equity classified warrants         $ 1 $ 45   $ 45
Changes in the fair value of warrants       $ (42)     $ 879  
2019 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock     28,350          
Exercise price     $ 0.24          
2020 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock   280,095       280,095    
Exercise price   $ 0.40       $ 0.40    
2020 JPM Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock 378,000              
Exercise price $ 0.42              
Public Warrant                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares of common stock       14,325,000     14,325,000  
Exercise price       $ 11.50     $ 11.50  
Issuance of equity classified warrants             $ 23,600  
Changes in the fair value of warrants             $ 3,200  
Maximum | 2019 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants     $ 100          
Maximum | 2020 SVB Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants   $ 100            
Maximum | 2020 JPM Common Stock Warrant                
Class of Warrant or Right [Line Items]                
Issuance of equity classified warrants $ 100