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Revenue from Contracts with Customers - Summary of Revenue from External Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Total	$ 194,101	$ 193,574	$ 177,164
United States [Member]
Revenue from External Customer [Line Items]
Total	189,890	188,710	172,610
Canada [Member]
Revenue from External Customer [Line Items]
Total	3,603	2,918	3,125
India and Other [Member]
Revenue from External Customer [Line Items]
Total	$ 608	$ 1,946	$ 1,429

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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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