Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, authorized	25,000,000	25,000,000
Convertible preferred stock, issued	0	0
Convertible preferred stock, outstanding	0	0
Convertible preferred stock, aggregate liquidation preference	$ 0	$ 0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized	500,000,000	500,000,000
Common stock, issued	38,183,373	37,583,945
Common stock, outstanding	38,183,373	37,583,945