Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Mandatorily redeemable convertible preferred stock, par value	$ 0.1	$ 0.1
Mandatorily redeemable convertible preferred stock, shares authorized	8,979	8,979
Mandatorily redeemable convertible preferred stock, shares issued	0	8,118
Mandatorily redeemable convertible preferred stock, shares outstanding	0	8,118
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	15,000	15,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	14,616	411
Common stock, shares outstanding	14,616	411