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Loss Per Share - Shares Excluded from Computation of Diluted Loss Per Share (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 7.9 4.0 7.2 3.4
Stock Options [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 6.2 3.6 5.5 3.0
Restricted Stock Units (RSUs) [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 1.3 0.0 1.3 0.0
Warrants [Member]
       
Antidilutive Securities [Line Items]        
Anti-dilutive potential common shares 0.4 0.4 0.4 0.4