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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Accounts receivable $ 41,136 $ 38,115
Short-term deferred revenue and customer prepayments (8,061) (5,507)
Long-term deferred revenue (813) (1,054)
Deferred expenses 1,588 1,897
Sales allowances (736) $ (741)
Accounting Standards Update 2014-09 [Member]    
Disaggregation of Revenue [Line Items]    
Accounts receivable 3,021  
Short-term deferred revenue and customer prepayments (2,554)  
Long-term deferred revenue 241  
Deferred expenses (309)  
Sales allowances $ 5