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Leases - Supplemental balance sheet information (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Operating Leases:    
Operating lease right-of-use asset $ 4,936 $ 4,950
Operating lease liability - current 2,200 1,459
Operating lease liability - noncurrent 3,658 4,500
Present value of lease liabilities $ 5,858 $ 5,959