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Detail of Interest and Other Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Income And Expenses [Abstract]    
Interest income $ 561 $ 2,145
Miscellaneous income (expense) 659 (39)
Other (91) (7)
Total interest and other income, net $ 1,129 $ 2,099