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Composition of Certain Reserves and Allowances (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Financing Receivable Allowance For Credit Losses [Line Items]    
Accounts receivable, Beginning balance $ 1,619 $ 660
Accounts receivable, Cumulative-effect adjustment of ASC 326 adoption   404
Current-period provision for expected credit losses 127 803
Write-offs charged against the allowances (216) (411)
Other and foreign currency 9 83
Financing Receivable, Ending balance 1,539 1,539
Other non-current assets    
Financing Receivable Allowance For Credit Losses [Line Items]    
Financing Receivable, Beginning balance 250  
Financing Receivable, Cumulative-effect adjustment of ASC 326 adoption   75
Financing Receivable, Current-period provision for expected credit losses 70 245
Financing Receivable, Ending balance $ 320 $ 320