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Lease Exit Liability - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 16, 2008
Restructuring Cost and Reserve [Line Items]          
Operating Lease     2018    
Onetime purchase payment under purchase agreement         $ 5,000,000
Incremental in-process research and development expense 0 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