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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 1,194 $ 1,394 $ 3,661 $ 4,141
Finance lease cost        
Amortization of right-of-use (“ROU”) asset 40 52 144 156
Interest expense 7 12 26 37
Short-term lease cost 38 105 270 322
Variable lease cost 326 363 840 1,160
Total lease cost $ 1,605 $ 1,926 $ 4,941 $ 5,816