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Segment Information and Information about Geographic Area (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments (in segment)									1		1
Revenues	$ 84,664	$ 82,671	$ 78,929	$ 75,343	$ 74,200	$ 71,658	$ 68,153	$ 64,878		$ 321,607		$ 278,889	$ 230,828
Property and equipment, net	60,579				61,442				$ 60,579	60,579	$ 60,579	61,442
United States
Segment Reporting Information [Line Items]
Revenues										206,555		185,887	162,681
Property and equipment, net	46,100				51,587				46,100	46,100	46,100	51,587
Foreign
Segment Reporting Information [Line Items]
Revenues										115,052		93,002	$ 68,147
Property and equipment, net	5,258				4,081				5,258	5,258	5,258	4,081
INDIA [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 9,221				$ 5,774				$ 9,221	$ 9,221	$ 9,221	$ 5,774

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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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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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