Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Future minimum payments
2019	$ 238
2020	363
2021	371
2022	31
Total minimum payments	1,003
Less: imputed interest	103
Present value of lease liabilities	900
Lease liabilities, net cash used in operating activities	$ 30
Weighted average, operating lease term	2 years 9 months 18 days
Weighted average, operating discount rate	5.50%
Operating lease costs	$ 57
Short-term lease costs	49
Variable lease costs	$ 0