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Cost Based Investments - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Feb. 19, 2014
Privately-held Company [Member]        
Schedule of Cost-method Investments [Line Items]        
Cost-based investment $ 300,000      
Maximum [Member] | Privately-held Company [Member]        
Schedule of Cost-method Investments [Line Items]        
Cost-based investment $ 1,700,000      
Technology Company [Member]        
Schedule of Cost-method Investments [Line Items]        
Cost-based investment   $ 300,000    
Scenario, Forecast [Member] | Technology Company [Member] | Maximum [Member]        
Schedule of Cost-method Investments [Line Items]        
Cost-based investment     $ 1,800,000  
Convertible Debt Securities [Member]        
Schedule of Cost-method Investments [Line Items]        
Notes receivable, fair value disclosure       $ 3,000,000
Debt instrument maturity date Feb. 19, 2014 Feb. 19, 2015    
Convertible note interest rate terms   Bore interest equal to the greater of (a) 0.5% or (b) annual interest rates    
Debt instrument interest rate       0.50%
Debt instrument maturity date Feb. 19, 2014 Feb. 19, 2015    
Convertible Debt Securities [Member] | Privately-held Company [Member]        
Schedule of Cost-method Investments [Line Items]        
Cost-based investment       $ 3,000,000