Statements of Convertible Preferred Stock and Changes in Stockholders' Equity (Deficit) (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Convertible Preferred Stock - Series C [Member]
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance costs			$ 2,746,612
Convertible Preferred Stock - Series C-1 [Member]
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance costs		$ 2,022,025
Convertible Preferred Stock - Series C-2 [Member]
Increase (Decrease) in Convertible Preferred Stock [Roll Forward]
Issuance costs	$ 3,782,650