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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]    
Accounts receivable $ 41,279 $ 38,115
Short-term deferred revenue and customer prepayments (6,753) (5,507)
Long-term deferred revenue (974) (1,054)
Deferred expenses 2,023 1,897
Sales allowances (781) $ (741)
Accounting Standards Update 2014-09 [Member]    
Disaggregation of Revenue [Line Items]    
Accounts receivable 3,164  
Short-term deferred revenue and customer prepayments (1,246)  
Long-term deferred revenue 80  
Deferred expenses 126  
Sales allowances $ (40)