Consolidated Balance Sheets [Parenthetical] (USD $)	Dec. 31, 2012
Stockholders Equity
Common stock, par value (in dollars per share)	$ 0.001
Common stock, shares authorized	130,322,900
Common stock, shares issued	5,391,095
Common stock, shares outstanding	5,391,095
Series A Redeemable Convertible Preferred Stock [Member]
Stockholders Equity
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.001
Redeemable convertible preferred stock, shares authorized	5,734,402
Redeemable convertible preferred stock, shares issued	5,696,261
Redeemable convertible preferred stock, shares outstanding	5,696,261
Series B Redeemable Convertible Preferred Stock [Member]
Stockholders Equity
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.001
Redeemable convertible preferred stock, shares authorized	11,504,298
Redeemable convertible preferred stock, shares issued	11,489,972
Redeemable convertible preferred stock, shares outstanding	11,489,972
Series B-1 Redeemable Convertible Preferred Stock [Member]
Stockholders Equity
Redeemable convertible preferred stock, par value (in dollars per share)	$ 0.001
Redeemable convertible preferred stock, shares authorized	48,454,545
Redeemable convertible preferred stock, shares issued	45,998,220
Redeemable convertible preferred stock, shares outstanding	45,998,220