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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Revenue	$ 64,799	$ 52,495	$ 49,554	$ 45,432	$ 54,506	$ 51,126	$ 45,694	$ 41,965	$ 212,280	$ 193,291	$ 192,304
Percent of Total									100.00%	100.00%	100.00%
Transferred at a point in time
Revenue
Revenue									$ 152,977
Transferred over time
Revenue
Revenue									$ 59,303
Maximum
Revenue
Amortization period for sales commissions (in years)									7 years
EMEA
Revenue
Revenue									$ 103,293	$ 92,859	$ 95,897
Percent of Total									49.00%	48.00%	50.00%
Americas
Revenue
Revenue									$ 54,979	$ 52,981	$ 33,204
Percent of Total									26.00%	27.00%	17.00%
APAC
Revenue
Revenue									$ 54,008	$ 47,451	$ 63,203
Percent of Total									25.00%	25.00%	33.00%
Hardware products
Revenue
Revenue									$ 105,560	$ 105,867	$ 126,198
Software licenses
Revenue
Revenue									47,417	41,390	29,859
Subscription
Revenue
Revenue									15,426	10,296	7,301
Professional services
Revenue
Revenue									5,743	4,891	4,681
Maintenance, support and other
Revenue
Revenue									$ 38,134	$ 30,847	$ 24,265

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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