Annual report pursuant to Section 13 and 15(d)

Leases - Lease Cost (Details)

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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 1,316 $ 1,617 $ 1,948
Variable lease cost 243 315 291
Total lease cost $ 1,559 $ 1,932 $ 2,239