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Prepaid Licensing and Royalty Fees - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expenses [Line Items]      
Impairment losses on prepaid licensing and royalty fees $ 85 $ 244  
Proceeds from return of prepaid licensing and royalty fees of terminated license     $ 1,750
Gain recognized upon termination of licensing and royalty agreement     1,732
Operating Expenses      
Prepaid Expenses [Line Items]      
Gain recognized upon termination of licensing and royalty agreement     $ 1,700