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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, 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Geographic, Customer and Supplier Information - Sales Details of Customers Locations in Four Geographic Regions (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 ($) segment	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($) segment
Geographic, Customer and Supplier Information
Number of geographic regions \| segment									3	3	3
Total revenue	$ 71,003	$ 79,725	$ 56,234	$ 47,608	$ 64,799	$ 52,495	$ 49,554	$ 45,432	$ 254,570	$ 212,280	$ 193,291
Gross profit	49,629	$ 53,056	$ 38,354	$ 31,569	42,246	$ 34,543	$ 35,981	$ 34,697	172,608	147,467	134,514
Long-lived assets	22,034				12,067				22,034	12,067	9,401
Operating Segments \| Europe, Middle East, Africa (EMEA)
Geographic, Customer and Supplier Information
Total revenue									147,027	103,293	92,859
Gross profit									99,689	71,840	61,506
Long-lived assets	8,085				7,665				8,085	7,665	8,437
Operating Segments \| Americas
Geographic, Customer and Supplier Information
Total revenue									61,577	54,979	52,981
Gross profit									41,752	38,204	41,491
Long-lived assets	13,240				4,247				13,240	4,247	897
Operating Segments \| Asia Pacific
Geographic, Customer and Supplier Information
Total revenue									45,966	54,008	47,451
Gross profit									31,167	37,423	31,517
Long-lived assets	$ 709				$ 155				$ 709	$ 155	$ 68