Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Mandatorily redeemable convertible preferred stock, par value	$ 0.0001	$ 0.0001
Mandatorily redeemable convertible preferred stock, shares authorized	8,978,672	8,978,672
Mandatorily redeemable convertible preferred stock, shares issued	0	8,118,240
Mandatorily redeemable convertible preferred stock, shares outstanding	0	8,118,240
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	15,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	14,619,818	411,226
Common stock, shares outstanding	14,619,818	411,226