Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Convertible preferred stock
Preferred stock, shares authorized (in shares)	26,000,000
STOCKHOLDERS' (DEFICIT) EQUITY
Common stock, par value (in dollars per share)	$ 0.00033	$ 0.00033
Common stock, shares authorized (in shares)	38,500,000	35,000,000
Common stock, shares issued (in shares)	1,688,475	1,688,475
Common stock, shares outstanding (in shares)	1,688,475	1,688,475
Convertible Preferred Stock - Series C-2 [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	12,500,000
Preferred stock, shares issued (in shares)	12,043,006
Preferred stock, shares outstanding (in shares)	12,043,006
Preferred stock, liquidation preference	$ 72,184,822
Convertible Preferred Stock - Series C-1 [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	4,000,000
Preferred stock, shares issued (in shares)	3,558,890
Preferred stock, shares outstanding (in shares)	3,558,890
Preferred stock, liquidation preference	$ 21,810,953	$ 20,819,976
Convertible Preferred Stock - Series C [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	5,500,000
Preferred stock, shares issued (in shares)	4,697,314
Preferred stock, shares outstanding (in shares)	4,697,314
Preferred stock, liquidation preference	$ 26,211,433	25,128,853
Convertible Preferred Stock - Series B-1 [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	500,000
Preferred stock, shares issued (in shares)	359,935
Preferred stock, shares outstanding (in shares)	359,935
Preferred stock, liquidation preference	$ 629,886	629,886
Convertible Preferred Stock - Series B [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	2,500,000
Preferred stock, shares issued (in shares)	2,415,116
Preferred stock, shares outstanding (in shares)	2,415,116
Preferred stock, liquidation preference	$ 3,018,895	3,018,895
Convertible Preferred Stock - Series A [Member]
Convertible preferred stock
Preferred stock, shares authorized (in shares)	1,000,000
Preferred stock, shares issued (in shares)	864,500
Preferred stock, shares outstanding (in shares)	864,500
Preferred stock, liquidation preference	$ 864,500	$ 864,500