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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total Revenue	$ 45,432	$ 41,965
Percent of Total	100.00%	100.00%
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenue	$ 33,494
Transferred over time
Disaggregation of Revenue [Line Items]
Total Revenue	11,938
EMEA
Disaggregation of Revenue [Line Items]
Total Revenue	$ 18,387	$ 18,370
Percent of Total	40.00%	44.00%
Americas
Disaggregation of Revenue [Line Items]
Total Revenue	$ 15,921	$ 12,124
Percent of Total	35.00%	29.00%
APAC
Disaggregation of Revenue [Line Items]
Total Revenue	$ 11,124	$ 11,471
Percent of Total	25.00%	27.00%
Hardware products
Disaggregation of Revenue [Line Items]
Total Revenue	$ 17,491	$ 21,744
Software licenses
Disaggregation of Revenue [Line Items]
Total Revenue	16,003	9,816
SaaS
Disaggregation of Revenue [Line Items]
Total Revenue	2,970	2,115
Services
Disaggregation of Revenue [Line Items]
Total Revenue	964	961
Maintenance, support and other
Disaggregation of Revenue [Line Items]
Total Revenue	8,004	7,329
Product and license
Disaggregation of Revenue [Line Items]
Total Revenue	$ 33,494	$ 31,561

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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
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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