Commitments and Contingencies - Lease Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease costs	$ 217	$ 652,000
Operating lease liabilities	$ 178	$ 540,000
Weighted average discount rate	6.50%	6.50%
Weighted average remaining lease term	5 years 29 days	5 years 29 days