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Loss Per Share - Shares Excluded from Computation of Diluted Loss Per Share (Detail)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities [Line Items]    
Anti-dilutive potential common shares 6.3 2.8
Stock Options [Member]
   
Antidilutive Securities [Line Items]    
Anti-dilutive potential common shares 4.5 2.4
Restricted Stock Units (RSUs) [Member]
   
Antidilutive Securities [Line Items]    
Anti-dilutive potential common shares 1.4 0.0
Warrants [Member]
   
Antidilutive Securities [Line Items]    
Anti-dilutive potential common shares 0.4 0.4