Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Loss Contingencies [Line Items]      
Operating lease expense $ 400 $ 500  
Weighted average remaining lease term (in years) 4 years 1 month 6 days   4 years 4 months 24 days
Weighted average rate (percent) 5.90%    
Right-of-use asset $ 5,678   $ 5,973
Present value of lease liabilities $ 6,089   6,396
Minimum      
Loss Contingencies [Line Items]      
Lease term (Less than, in years) 1 year    
Maximum      
Loss Contingencies [Line Items]      
Lease term (Less than, in years) 7 years    
Performance Guarantee      
Loss Contingencies [Line Items]      
Performance bonds outstanding $ 92,100   $ 78,000