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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Loss Contingencies [Line Items]          
Operating lease expense $ 400 $ 600 $ 800 $ 1,100  
Weighted average remaining lease term (in years) 4 years 7 months 6 days   4 years 7 months 6 days   4 years 4 months 24 days
Weighted average rate (percent) 5.90%   5.90%    
Right-of-use asset $ 6,471   $ 6,471   $ 5,973
Lease liabilities 6,949   6,949   6,396
Other Assets          
Loss Contingencies [Line Items]          
Right-of-use asset 6,500   6,500   6,000
Accrued Expenses and Other Liabilities          
Loss Contingencies [Line Items]          
Lease liabilities $ 6,900   $ 6,900   6,400
Minimum          
Loss Contingencies [Line Items]          
Lease term (in years) 1 year   1 year    
Maximum          
Loss Contingencies [Line Items]          
Lease term (in years) 7 years   7 years    
Performance Guarantee          
Loss Contingencies [Line Items]          
Performance bonds outstanding $ 97,600   $ 97,600   $ 78,000