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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, 2019
Jun. 30, 2019
Leases [Abstract]    
Operating lease expense $ 653 $ 1,306
Finance lease expense:    
Amortization of right-of-use assets 220 220
Interest on lease liabilities 3 3
Total finance lease expense 223 223
Short-term lease expense 32 75
Total lease expense 908 1,604
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 583 1,165
Operating cash flows from finance leases 3 3
Financing cash flows from finance leases $ 38 $ 38