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Leases - Future Minimum Rental Receipts Under Non-cancelable Lease Agreements (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Lessor, Operating Lease, Payments to be Received, Remainder of Fiscal Year $ 153
Lessor, Operating Lease, Payments to be Received, Two Years 307
Lessor, Operating Lease, Payments to be Received, Three Years 307
Lessor, Operating Lease, Payments to be Received, Four Years 307
Lessor, Operating Lease, Payments to be Received $ 1,074