Condensed Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Redeemable convertible preferred stock, liquidation preference (in dollars)	$ 0	$ 6,777,338
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	15,000,000
Common stock, shares issued	8,119,923	8,119,923
Common stock, shares outstanding	2,874,330	2,874,330
Series A redeemable convertible preferred stock
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Redeemable convertible preferred stock, shares authorized	0	3,017,488
Redeemable convertible preferred stock, shares issued		3,015,902
Redeemable convertible preferred stock, shares outstanding	0	3,015,902