Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Other property and equipment	$ 45
Accrued liabilities	$ 45
Weighted-average remaining lease term (years)	2 months 12 days
Weighted-average discount rate	5.00%
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentOtherNet
Operating lease, liability, statement of financial position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent