Deferred Revenue and Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2012
Deferred Revenue Disclosure [Abstract]
Fisher agreement	$ 0	$ 13
Products not yet delivered	35	114
Total current deferred revenue and income	35	127
Arizona Commerce Authority grant	1,000	1,000	$ 1,000
Total long-term deferred income	1,000	$ 1,000
Deferred revenue recognized	$ 114