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Leases - Lease costs and other lease information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease costs        
Operating lease cost $ 429 $ 634 $ 1,417 $ 1,825
Variable lease cost 192 223 583 888
Short-term lease cost 89 102 172 304
Finance lease cost        
Interest on lease liabilities 7 10 22 33
Amortization of right-of-use assets 29 29 87 87
Sublease Income (51) (57) (163) (175)
Net lease cost 695 941 2,118 2,962
Cash paid for amounts included in the measurement of lease liabilities operating cash flows from operating leases $ 411 $ 628 $ 1,372 1,807
Right-of-use assets obtained in exchange for new operating lease liabilities       $ 1,531