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Commitments and Contingencies - Supplemental Cash Flow Information (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash flows from operating leases $ 852
Operating cash flows from finance leases 179
Financing cash flows from finance leases 347
Right-of-use assets obtained in exchange for lease obligations:  
Operating leases 1,006
Finance leases $ 672