Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 112
Weighted-average remaining lease term (years)	4 months 24 days
Weighted-average discount rate	5.00%
Other property and equipment
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 112
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 112