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Fair Value of Cash and Cash Equivalents (Detail) - Level 1 [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total cash and cash equivalents $ 33,851 $ 41,731
Cash    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total cash and cash equivalents 13,492 14,463
Mutual Fund    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Total cash and cash equivalents $ 20,359 $ 27,268