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Fair Value Accounting - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]        
Sales of marketable securities $ 0 $ 0    
Cash flow discount rate     20.00%  
Increase / decrease in contingent consideration liability and non-operating, non-cash gain $ 200,000      
Increase (decrease) in net gain per share $ 0.009      
Increased (decreased) in net loss resulted from change in discount rate   $ 14,833,000    
Increased (decreased) in net loss per share resulted from change in discount rate   $ 0.75    
Estimated fair value of financing obligations $ 50,028,000     $ 52,151,000
Book values of financing obligations $ 67,953,000     $ 67,967,000
Allegro stockholders [Member]        
Business Acquisition, Contingent Consideration [Line Items]        
Payments To Former Allegro Stockholders   $ 867,000