Accrued Liabilities and Other (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued vacation	$ 822	$ 824
Accrued paid personal leave	497	494
Accrued bonus	634	126
Other	1,308	366
Total	$ 3,261	$ 1,810