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Commitments and Contingencies - Minimum lease commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Minimum lease commitments, Payments due by period:    
2021 $ 3,559  
2022 4,335  
2023 3,170  
2024 2,896  
2025 2,506  
Thereafter 38,367  
Total future minimum lease payments 54,833  
Less: Imputed interest (19,037)  
Total operating lease liabilities 35,796  
Operating lease liability, current $ 4,375 $ 4,148
Operating Lease, Liability, Current, Statement of Financial Position Accrued expenses and other current liabilities  
Operating lease liability, noncurrent $ 31,421 $ 6,305
Total operating lease liabilities $ 35,796