Deferred Revenue and Income (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Aug. 31, 2012
Deferred Revenue Disclosure [Abstract]
Offset to research and development project	$ 0	$ 0	$ 0	$ 1,200,000
Products and services not yet delivered	78,000		78,000		$ 35,000
Arizona Commerce Authority grant	1,000,000		1,000,000		0
Arizona Commerce Authority grant	1,078,000		1,078,000		35,000
Arizona Commerce Authority grant	0		0		1,000,000
Total long-term deferred income	0		0		$ 1,000,000
Milestone payments from the Arizona Commerce Authority	$ 1,000,000.0		$ 1,000,000.0			$ 1,000,000.0