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Debt - Revolving Loan (Details) - USD ($)
Sep. 30, 2021
May 25, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Outstanding unamortized loan fees     $ 83,000
Prepaid expenses and other current assets      
Debt Instrument [Line Items]      
Outstanding unamortized loan fees $ 0   74,000
Other long-term assets      
Debt Instrument [Line Items]      
Outstanding unamortized loan fees     9,000
Credit Facility      
Debt Instrument [Line Items]      
Borrowing capacity   $ 25,000,000  
Long-term debt     $ 0