Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 321,324	$ 317,923	$ 307,251
United States
Disaggregation of Revenue [Line Items]
Revenue	292,107	287,723	274,391
International
Disaggregation of Revenue [Line Items]
Revenue	$ 29,217	$ 30,200	$ 32,860

Amount, including 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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+ Details