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Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net Income/(loss) $ 412 $ (2,069)
Deemed dividend for beneficial conversion feature on Series D-2 Preferred (909)   
Deemed dividend for antidilution adjustments to convertible preferred stock (214)   
Accretion of convertible preferred stock (510)   
Net loss attributable to common stock - basic (1,221) (2,069)
Derivative fair value adjustment (2,783)   
Net loss attributable to common stock - diluted $ (4,004) $ (2,069)
Weighted-average common shares outstanding - basic 334,086 335,782
Allocation of common stock warrants as participating securities 274,988   
Weighted-average of outstanding common stock - diluted 609,075 335,782
Basic EPS $ (3.65) $ (6.16)
Diluted EPS $ (6.57) $ (6.16)