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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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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, 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 ($) segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($) segment
Geographic, Customer and Supplier Information
Number of geographic regions \| segment									3	3	3
Total revenue	$ 52,928	$ 51,439	$ 54,954	$ 56,370	$ 70,531	$ 79,691	$ 56,167	$ 47,095	$ 215,691	$ 253,484	$ 211,336
Gross profit	39,262	$ 35,961	$ 36,729	$ 40,300	49,157	$ 53,022	$ 38,287	$ 31,056	152,252	171,522	146,523
Long-lived assets	23,191				22,034				23,191	22,034	12,067
As Previously Reported
Geographic, Customer and Supplier Information
Total revenue										254,570	212,280
Gross profit										172,608	147,467
Operating Segments \| Europe, Middle East, Africa (EMEA)
Geographic, Customer and Supplier Information
Total revenue									117,086	145,942	102,349
Gross profit									82,649	98,753	70,960
Long-lived assets	7,482				8,085				7,482	8,085	7,665
Operating Segments \| Americas
Geographic, Customer and Supplier Information
Total revenue									53,171	61,577	54,979
Gross profit									37,532	41,667	38,118
Long-lived assets	14,968				13,240				14,968	13,240	4,247
Operating Segments \| Asia Pacific
Geographic, Customer and Supplier Information
Total revenue									45,434	45,965	54,008
Gross profit									32,071	31,102	37,445
Long-lived assets	$ 741				$ 709				$ 741	$ 709	$ 155