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Segment Information and Geographic Information - Geographical Data for Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total net revenues	$ 18,626	$ 17,537	$ 16,153	$ 14,511	$ 14,688	$ 13,660	$ 13,164	$ 12,467	$ 66,827	$ 53,979
United States [Member]
Revenue:
Total net revenues									40,687	38,337
International [Member]
Revenue:
Total net revenues									$ 26,140	$ 15,642

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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