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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue
Revenue	$ 52,495	$ 51,126	$ 147,481	$ 138,785
Percent of Total	100.00%	100.00%	100.00%	100.00%
Transferred at a point in time
Revenue
Revenue	$ 36,882		$ 105,362
Transferred over time
Revenue
Revenue	15,613		42,119
EMEA
Revenue
Revenue	$ 25,281	$ 22,768	$ 65,148	$ 62,868
Percent of Total	48.00%	45.00%	44.00%	45.00%
Americas
Revenue
Revenue	$ 11,055	$ 14,419	$ 40,246	$ 37,880
Percent of Total	21.00%	28.00%	27.00%	27.00%
APAC
Revenue
Revenue	$ 16,159	$ 13,939	$ 42,087	$ 38,037
Percent of Total	31.00%	27.00%	29.00%	28.00%
Hardware products
Revenue
Revenue	$ 27,056	$ 26,606	$ 69,123	$ 73,607
Software licenses
Revenue
Revenue	9,826	11,815	36,239	30,847
Subscription
Revenue
Revenue	4,161	3,023	10,949	7,634
Professional services
Revenue
Revenue	1,594	1,354	3,715	3,384
Maintenance, support and other
Revenue
Revenue	$ 9,858	$ 8,328	$ 27,455	$ 23,313

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
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-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

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-Name Accounting Standards Codification
-Topic 606
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