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Related Parties - Revenue, Accounts Receivable and Contract Liabilities for Investors of the Company (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stockholder A    
Related Party Transaction [Line Items]    
Accounts receivable $ 0 $ 22
Stockholder B    
Related Party Transaction [Line Items]    
Contract liabilities (current) 0 65
Stockholder D    
Related Party Transaction [Line Items]    
Contract liabilities (current) 0 500
Prototype sales | Stockholder A    
Related Party Transaction [Line Items]    
Revenue 0 60
Development contracts | Stockholder B    
Related Party Transaction [Line Items]    
Revenue 0 100
Development contracts | Stockholder C    
Related Party Transaction [Line Items]    
Revenue $ 0 $ 1,050