Related Parties (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Biosciences Managers [Member]
Current liabilities due to related parties	$ 10,000
Intrexon Corporation [Member]
Value of common stock paid for technology access fee			$ 3,000,000
Fees payable upon commencement of first Phase 2 trial	2,500,000
Fees payable upon first regulatory approval	5,000,000
Milestone payments paid per collaboration agreement	0
Cash paid for channel collaboration agreement	117,000	$ 125,000
Current liabilities due to related parties	$ 0