License Agreements and Grants - National Institute of Health Grant (Details) - National Institute of Health Grant - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2015	Dec. 31, 2016	Jan. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Length of project (years)	5 years
Total grant funding	$ 5,000,000	$ 74,000	$ 818,000	$ 483,000	$ 0