Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 179
Weighted-average remaining lease term	8 months 12 days
Weighted-average discount rate	5.00%
Other property and equipment
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 179
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 179