Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Preferred stock, shares authorized		28,659,924
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	120,000,000	43,509,727
Common stock, shares issued	26,410,251	1,020,088
Common stock, shares outstanding	26,410,251	1,020,088
Series AA Redeemable Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	0	25,757,874
Preferred stock, shares issued	0	24,057,013
Preferred stock, shares outstanding	0	24,057,013
Series X Redeemable Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	0	2,902,050
Preferred stock, shares issued	0	1,892,320
Preferred stock, shares outstanding	0	1,892,320