Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Preferred stock, shares authorized		75,772,871
Redeemable convertible preferred stock, liquidation preference	$ 0	$ 95,619
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	95,500,000
Common stock, shares issued	23,670,079	909,880
Common stock, shares outstanding	23,670,079	909,880
Undesignated Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Redeemable Convertible Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	7,285,456	75,772,871
Preferred stock, shares issued	0	73,487,415
Preferred stock, shares outstanding	0	73,487,415