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Debt - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 03, 2017
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Line of Credit Facility [Line Items]            
Repayments of long-term debt   $ 100,000 $ 0      
Line of credit | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Termination fee on loan, percentage of revolving line of credit   1.00%        
Early termination fee on loan   $ 100,000        
Line of credit | Silicon Valley Bank            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 35,000,000.0          
Periodic payment terms, balloon payment to be paid   1,200,000        
Long-term debt balance outstanding   1,079,000       $ 1,026,000
Line of credit | Silicon Valley Bank | Secured Debt            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity 25,000,000.0          
Periodic payment terms, balloon payment to be paid 1,200,000          
Line of credit | Silicon Valley Bank | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 10,000,000.0          
Repayments of long-term debt       $ 100,000 $ 24,900,000  
Term Loan Advance | Silicon Valley Bank            
Line of Credit Facility [Line Items]            
Long-term debt balance outstanding   $ 1        
London Interbank Offered Rate (LIBOR) | Line of credit | Silicon Valley Bank | Secured Debt            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 4.20%          
London Interbank Offered Rate (LIBOR) | Line of credit | Silicon Valley Bank | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 3.50%          
Minimum | London Interbank Offered Rate (LIBOR) | Line of credit | Silicon Valley Bank | Secured Debt            
Line of Credit Facility [Line Items]            
Interest rate, stated percentage 5.43%          
Minimum | London Interbank Offered Rate (LIBOR) | Line of credit | Silicon Valley Bank | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Interest rate, stated percentage 4.70%          
Debt prepayment tranche three | London Interbank Offered Rate (LIBOR) | Line of credit | Silicon Valley Bank | Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Prepayment premium $ 250,000