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Leases - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease expense $ 283 $ 653 $ 854 $ 1,306
Amortization of right-of-use assets 4 220 9 220
Interest on lease liabilities 5 3 9 3
Total finance lease expense 9 223 18 223
Short-term lease expense 54 32 86 75
Total lease expense 346 908 958 1,604
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases 1,411 583 1,024 1,165
Operating cash flows from finance leases 5 3 9 3
Financing cash flows from finance leases $ 14 $ 38 $ 51 $ 38