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Summary of Significant Accounting Policies - Geographical Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | segment									2
Number of reportable segments | segment									1
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 69,377	$ 68,636	$ 76,535	$ 77,122	$ 90,588	$ 52,210	$ 77,846	$ 88,105	$ 291,670	$ 308,749	$ 325,839
Property and equipment, net	11,732				26,525				11,732	26,525
Domestic
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									228,639	232,183	249,674
Property and equipment, net	7,282				19,278				7,282	19,278
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									63,031	76,566	$ 76,165
Property and equipment, net	$ 4,450				$ 7,247				$ 4,450	$ 7,247

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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