License Agreements and Grants - Arizona Commerce Authority and R&D Refundable Tax Credit Program (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2012 USD ($) job milestone	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
License Agreements and Grants - Research and Development [Abstract]
Arizona Commerce Authority grant | $	$ 1,000,000.0	$ 1,000,000.0		$ 1,000,000.0		$ 1,000,000
Number of milestones | milestone	4
Qualified jobs created, milestone one | job	15
Qualified jobs created, milestone two | job	30
Qualified jobs created, milestone three | job	40
Qualified jobs created, milestone four | job	65
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Offset to research and development project | $		$ 0	$ 0	$ 1,200,000	$ 647,000
Minimum
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Capital investment milestone | $	$ 4,500,000
Grant related minimum annual wages | $	$ 63,000
Percent of company paid premiums	65.00%