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Leases - Summary of Cash Paid for Amounts Included in Measurement of Lease Liabilities (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 finance leases $ 46
Operating cash flows from operating leases 1,087
Financing cash flows from finance leases $ 6