Segment and Related Information - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue	$ 213,786	$ 187,232	$ 201,246
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue	195,660	175,180	188,026
International
Segment Reporting, Asset Reconciling Item [Line Items]
Revenue	$ 18,126	$ 12,052	$ 13,220

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details