Nature of Business, Financial Condition and Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		106 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Nature Of Business [Line Items]
Net loss from operation	$ (11,972)	$ (18,370)	$ (274,710)
Deficit accumulated during development stage	(274,125)		(274,125)	(262,153)
Cash and cash equivalents	$ 8,422	$ 54,102	$ 8,422	$ 24,625	$ 66,744