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Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 161 $ 321
Operating cash flows from finance leases 2 3
Financing cash flows from finance leases 5 9
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases 0 1,638
Finance leases $ 0 $ 0