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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Accounts receivable $ 40,999 $ 38,115
Short-term deferred revenue and customer prepayments (7,309) (5,507)
Long-term deferred revenue (733) (1,054)
Deferred expenses 1,650 1,897
Sales allowances (597) $ (741)
Accounting Standards Update 2014-09 [Member]    
Disaggregation of Revenue [Line Items]    
Accounts receivable 2,884  
Short-term deferred revenue and customer prepayments (1,802)  
Long-term deferred revenue 321  
Deferred expenses (247)  
Sales allowances $ 144