CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
BALANCE SHEETS
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, authorized	0	6,819,197
Convertible preferred stock, issued	0	5,262,728
Convertible preferred stock, outstanding	0	5,262,728
Liquidation preference value (in dollars)	$ 0
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	15,555,555
Common stock, shares issued	12,620,682	243,260
Common stock, shares outstanding	12,620,682	243,260