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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 51,080	$ 40,999
Short-term deferred revenue and customer prepayments	(3,390)	(7,309)
Long-term deferred revenue	(493)	(733)
Deferred expenses	848	1,650
Sales allowances	(1,661)	$ (597)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable	10,081
Short-term deferred revenue and customer prepayments	3,919
Long-term deferred revenue	240
Deferred expenses	(802)
Sales allowances	$ (1,064)

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