Operating Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) $ / ft²	Jun. 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		$ 102
Variable lease cost	33		59
Total	86		161
Maturities of Lease Liability [Abstract]
2019	104		104
2020	213		213
2021	219		219
2022	55		55
Total lease payments	591		591
Less: Interest	(58)		(58)
Present value of lease liability	$ 533		$ 533
Remaining lease term			2 years 9 months
Discount rate	7.50%		7.50%
Operating cash outflows from operating lease			$ 102
Rent expense		$ 54		$ 106
Future Minimum Lease Payments [Abstract]
2019	$ 217		217
2020	220		220
2021	219		219
2022	55		55
2023	$ 0		$ 0