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Debt - Growth Capital Advance (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2020
USD ($)
tranche
Debt Instrument [Line Items]        
Proceeds from borrowing on credit facilities $ 0 $ 64,563,000 $ 0  
Repayments of lines of credit 38,124,000 26,439,000 $ 0  
Debt outstanding 0      
Line of Credit | Growth Capital Advance Line Of Credit | Revolving Credit Facility        
Debt Instrument [Line Items]        
Number of tranches | tranche       3
Maximum borrowing capacity, under each tranche       $ 5,000,000
Maximum borrowing capacity       $ 15,000,000
Proceeds from borrowing on credit facilities   15,000,000    
Repayments of lines of credit   $ 15,000,000    
Liquidity threshold 65,000,000      
Debt outstanding $ 0