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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, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($) segment
Geographic, Customer and Supplier Information
Number of geographic regions \| segment									3
Total revenue	$ 64,799	$ 52,495	$ 49,554	$ 45,432	$ 54,506	$ 51,126	$ 45,694	$ 41,965	$ 212,280	$ 193,291	$ 192,304
Gross profit	42,246	$ 34,543	$ 35,981	$ 34,697	35,908	$ 36,646	$ 32,048	$ 29,912	147,467	134,514	130,657
Long-lived assets	12,067				9,401				12,067	$ 9,401	$ 7,721
As Previously Reported
Geographic, Customer and Supplier Information
Number of geographic regions \| segment										4	4
Operating Segments \| Europe, Middle East, Africa (EMEA)
Geographic, Customer and Supplier Information
Total revenue									103,293	$ 92,859	$ 95,897
Gross profit									71,840	61,506	67,008
Long-lived assets	7,665				8,437				7,665	8,437	7,013
Operating Segments \| Americas
Geographic, Customer and Supplier Information
Total revenue									54,979	52,981	33,204
Gross profit									38,204	41,491	21,519
Long-lived assets	4,247				897				4,247	897	634
Operating Segments \| Asia Pacific
Geographic, Customer and Supplier Information
Total revenue									54,008	47,451	63,203
Gross profit									37,423	31,517	42,130
Long-lived assets	$ 155				$ 68				$ 155	$ 68	$ 74