Operating Leases (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / ft²	Sep. 30, 2018 USD ($)
Operating Leases [Abstract]
Annual base rent (per square foot) | $ / ft²			9.00
Annual increase per square foot (in dollars per square foot) | $ / ft²			0.25
Cost Components of Operating Leases [Abstract]
Operating lease cost	$ 53		$ 158
Variable lease cost	26		85
Total	79		243
Maturities of Lease Liability [Abstract]
2019	52		52
2020	213		213
2021	219		219
2022	55		55
Total lease payments	539		539
Less: Interest	(49)		(49)
Present value of lease liability	$ 490		$ 490
Remaining lease term			2 years 6 months
Discount rate	7.50%		7.50%
Operating cash outflows from operating lease			$ 154
Rent expense		$ 54		$ 160
Future Minimum Lease Payments [Abstract]
2019	$ 217		217
2020	220		220
2021	219		219
2022	55		55
2023	$ 0		$ 0