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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Transfer of assets and liabilities between levels   $ 0    
Amount outstanding under the Senior Credit Facility   0    
Loss recorded in research and development due to change in fair value of contingent consideration liabilities $ 0 0 $ 42,000  
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash Equivalents, at Carrying Value   $ 178,103,000   $ 3,057,000