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Lease Exit Liability - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Jul. 16, 2008
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]        
Operating Lease 2018      
Onetime purchase payment under purchase agreement $ 5,000,000      
Additional amounts recorded   0 0 0
Minimum [Member]
        
Restructuring Cost and Reserve [Line Items]        
Onetime payment paid under license of product 8,000,000      
Maximum [Member]
        
Restructuring Cost and Reserve [Line Items]        
Onetime payment paid under license of product $ 12,000,000      
Convertible Preferred Stock Series D [Member]
        
Restructuring Cost and Reserve [Line Items]        
Shares issued in connection with acquisition 12,466,039