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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 328 $ 1,069
Net lease cost $ 328 1,069
Cash paid for amounts included in the measurement of lease liabilities, operating leases   754
Right-of-use assets obtained in exchange for lease obligations, operating leases   $ 495