Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		99 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Other Income And Expenses [Abstract]
Interest expense	$ (1,477)	$ (15)	$ (2,865)	$ (15)	$ (5,399)
Gain on conversion of notes payable to related parties					821
Sale of New Jersey state tax benefit			1,268		1,268
(Expense)/income due to change in fair value measurements	(3,585)	(788)	(3,850)	(441)	(3,851)
Other income, net			1	29	973
Other income (expense), net	$ (5,062)	$ (803)	$ (5,446)	$ (427)	$ (6,188)