Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 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	8,118	8,118
Mandatorily redeemable convertible preferred stock, shares outstanding	8,118	8,118
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	11,713	11,713
Common stock, shares issued	583	411
Common stock, shares outstanding	583	411