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Summary of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Prepaid licensing and royalty, total impairment losses $ 0 $ 85 $ 244
Property, plant and equipment, total impairment loss   109  
Intangible assets, total impairment losses   15  
Fair Value, Measurements, Nonrecurring      
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]      
Prepaid licensing and royalty, written down   0  
Prepaid licensing and royalty, total impairment losses   85  
Property, plant and equipment, total impairment loss [1]   109  
Intangible assets, total impairment losses [2]   $ 15  
[1] Impairment losses on certain property, plant, and equipment which were determined to be impaired: In 2019, we recognized an impairment loss of $109 thousand on property, plant and equipment as while the recent years’ operating losses were expected to continue in the short-term, the carrying amounts of those long-lived assets would not be recoverable based on cash flow projections.
[2] Impairment losses on certain intangible assets which were determined to be impaired: In 2019, we recognized an impairment loss of $15 thousand on intangible assets as while the recent years’ operating losses were expected to continue in the short-term, the carrying amounts of those intangible assets would not be recoverable based on cash flow projections.