CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	27,997,128	16,267,038
Common stock, shares outstanding	27,997,128	16,267,038
Redeemable Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	6,176,748
Preferred stock, shares outstanding	0	6,176,748
Temporary equity, liquidation preference	$ 0	$ 19,827,361
Series A Convertible Preferred Stock [Member]
Preferred stock shares designated	6,176,748
Preferred stock, shares issued	2,709,690
Preferred stock, shares outstanding	2,709,690
Temporary equity, liquidation preference	2,915,122
Series B Convertible Preferred Stock [Member]
Preferred stock shares designated	2,750
Preferred stock, shares issued	1,102
Preferred stock, shares outstanding	1,102
Temporary equity, liquidation preference	$ 1,102,000