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Revenues - Summary of Changes in Certain Contract Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 47,697	$ 40,999
Short-term deferred revenue and customer prepayments	(6,008)	(7,309)
Long-term deferred revenue	(653)	(733)
Deferred expenses	1,726	1,650
Sales allowances	(1,253)	$ (597)
Accounting Standards Update 2014-09 [Member]
Disaggregation of Revenue [Line Items]
Accounts receivable	6,698
Short-term deferred revenue and customer prepayments	1,301
Long-term deferred revenue	80
Deferred expenses	76
Sales allowances	$ (656)

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