Accrued Liabilities (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities [Line Items]
Beginning Balance	$ 687	$ 0
Additions for estimated future expense	207	1,341
Incurred costs	(408)	(654)
Adjustment from remeasurement	(133)
Closing Balance	353	687
Current portion			$ 353	$ 686
Long-term portion			0	1
Total	687	687	353	687
Maintenance [Member]
Accrued Liabilities [Line Items]
Beginning Balance	483	0
Additions for estimated future expense	0	911
Incurred costs	(229)	(428)
Adjustment from remeasurement	(133)
Closing Balance	121	483
Current portion			121	483
Long-term portion			0	0
Total	483	483	121	483
Warranty [Member]
Accrued Liabilities [Line Items]
Beginning Balance	204	0
Additions for estimated future expense	207	430
Incurred costs	(179)	(226)
Closing Balance	232	204
Current portion			232	203
Long-term portion			0	1
Total	$ 204	$ 204	$ 232	$ 204