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Debt - Revolving Loan (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Outstanding unamortized loan fees   $ 83,000
Long-term debt $ 464,848,000 282,196,000
Credit Facility    
Debt Instrument [Line Items]    
Long-term debt 0 0
Borrowing capacity 25,000,000  
Prepaid expenses and other current assets    
Debt Instrument [Line Items]    
Outstanding unamortized loan fees $ 64,000 74,000
Noncurrent assets    
Debt Instrument [Line Items]    
Outstanding unamortized loan fees   $ 9,000