Consolidated Balance Sheets (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Convertible preferred stock, par value	$ 0.00001	$ 0.00001
Convertible preferred stock, shares authorized	0	53,496,241
Convertible preferred stock, shares issued	0	50,985,652
Convertible preferred stock, shares outstanding	0	50,985,652
Convertible preferred stock aggregate liquidation value	$ 0	$ 352,626,000
Preferred stock, par value	$ 0.00001	$ 0.00001
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)	$ 0.00001	$ 0.00001
Common stock, shares authorized	200,000,000	80,000,000
Common stock, shares issued	41,110,127	4,286,164
Common stock, shares outstanding	41,110,127	4,286,164