Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Lease expense	$ 300	$ 1,000
Payments against operating lease liabilities	300	1,000
Operating lease right-of-use assets, net	8,173	8,173
Current portion of lease liabilities	316	316
Other long-term liabilities	10,052	10,052	$ 2,119
Total operating lease liabilities	$ 10,368	$ 10,368
Weighted average remaining lease term (years)	12 years 1 month 6 days	12 years 1 month 6 days
Weighted average discount rate	11.00%	11.00%
Non-cash lease expense		$ 196
Change in operating lease liabilities		119
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Year 1	$ 1,441	1,441
Year 2	1,453	1,453
Year 3	1,517	1,517
Year 4	1,523	1,523
Year 5	1,563	1,563
Thereafter	11,725	11,725
Total lease payments	19,222	19,222
Less imputed interest	(8,854)	(8,854)
Total	$ 10,368	$ 10,368