Computation of Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended	12 Months Ended		162 Months Ended
	Jul. 02, 2008	May 21, 2008	Jun. 30, 2008	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net loss				$ (12,088)	$ (9,675)	$ (84,080)
Preferred stock dividends				(867)	(976)	(5,104)
Preferred stock accretion				(229)	(230)	(4,274)
Warrant modification	20	502	2,160	(8,763)
Net loss applicable to common stockholders				$ (21,947)	$ (10,881)	$ (102,221)
Basic and diluted net loss per share				$ (1.30)	$ (0.72)
Shares used in computing basic and diluted net loss per share				16,874	15,131