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Loan Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Oct. 19, 2012
Dec. 31, 2016
Dec. 31, 2015
Accounts Notes And Loans Receivable [Line Items]      
Term loan facility $ 1,000    
Estimated future cash flow projections, effective interest rate   18.00%  
On first 10 million gross revenue [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Gross revenue realized by borrower from patents acquired utilizing the term loan facility, company's entitlement percentage   15.00%  
On all gross revenue over first 10 million [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Gross revenue realized by borrower from patents acquired utilizing the term loan facility, company's entitlement percentage   10.00%  
Term Loan [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percentage of interest on Term loan facility 15.00% 15.00% 15.00%
Term loan maturity date Oct. 18, 2017