Recapitalization (Details) (USD $)	12 Months Ended				12 Months Ended			1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended							12 Months Ended											1 Months Ended
	Dec. 31, 2011		Dec. 31, 2012	Dec. 31, 2012 Series A-1 financing Former operating company	Dec. 31, 2012 Series A-1 financing Former operating company Stage I and II	Dec. 31, 2012 Series A-1	May 17, 2011 Series A-1	May 31, 2011 Series A-1 Series A-1 financing Stage I	May 17, 2011 Series A-1 Series A-1 financing Stage I	Nov. 30, 2011 Series A-1 Series A-1 financing Stage II	Nov. 18, 2011 Series A-1 Series A-1 financing Stage II	Dec. 31, 2011 Series A-1 Series A-1 financing Stage III	Dec. 14, 2011 Series A-1 Series A-1 financing Stage III	May 31, 2011 Series A-1 Series A-1 financing Former operating company	Dec. 31, 2012 Series A-1 Series A-1 financing Former operating company	Dec. 31, 2012 Series A-1 Series A-1 financing Former operating company Stage I and II	Dec. 31, 2012 Series A-2	Dec. 31, 2012 Series A-3	Dec. 31, 2012 Series A-4	Dec. 31, 2012 Series A-5	Dec. 31, 2011 Additional paid-in-capital		Dec. 31, 2011 Accumulated Deficit		Dec. 31, 2011 Series A Convertible Preferred Stock		Dec. 31, 2011 Series B Convertible Preferred Stock		Dec. 31, 2011 Series C Convertible Preferred Stock		May 17, 2011 Forced Conversion	May 31, 2011 Forced Conversion Common Stock	May 31, 2011 Forced Conversion Series A Convertible Preferred Stock	May 31, 2011 Forced Conversion Series B Convertible Preferred Stock	May 31, 2011 Forced Conversion Series C Convertible Preferred Stock	May 31, 2011 Recapitalization Series A Convertible Preferred Stock	May 31, 2011 Recapitalization Series A Convertible Preferred Stock Series A-4	May 31, 2011 Recapitalization Series B Convertible Preferred Stock	May 31, 2011 Recapitalization Series B Convertible Preferred Stock Series A-3	May 31, 2011 Recapitalization Series C Convertible Preferred Stock	May 31, 2011 Recapitalization Series C Convertible Preferred Stock Series A-2
Recapitalization
Preferred Stock conversion ratio							0.1																								0.2
Number of shares converted																																	21,661	177,697	314,496	40,003		1,422,300		9,832,133
Number of shares issued upon conversion																																102,767					40,003		1,422,300		9,832,133
Additional shares issued in exchange for additional investment														1,327,506
Net proceeds from issuance of preferred stock (in dollars)	$ 62,116,000							$ 20,300,000		$ 21,000,000		$ 21,000,000
Number of shares issued						939,612			2,631,845		263,178		263,180				983,208	142,227	3,998	6,443
Difference between the fair value of the new shares of Preferred Stock issued in the exchange and the carrying value of the Old Preferred Stock shares	60,937,000
Recapitalization amount allocated	60,981,000	[1]																			8,269,000	[1]	52,712,000	[1]	(60,000)	[1]	(39,183,000)	[1]	(108,425,000)	[1]
Number of shares that can be purchased for warrants issued															818	1,636
Exercise price of warrants (in dollars per unit)				$ 81.42	$ 81.42
Fair value of warrants issued (in dollars)	$ 450,000		$ 830,000	$ 35,000	$ 68,000
Expiration term of warrants					5 years

[1] The recapitalization includes the exchange of Series A, Series B and Series C shares for Series A-4, Series A-3, and Series A-2 shares, respectively, in addition to the 1:10 exchange of Series A-2, Series A-3, and Series A-4 preferred stock, which occurred in conjunction with the Merger, and is more fully described in note 4.