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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 49,554	$ 45,694	$ 94,986	$ 87,658
Percent of Total	100.00%	100.00%	100.00%	100.00%
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	$ 34,986		$ 68,480
Transferred over time
Disaggregation of Revenue [Line Items]
Revenue	14,568		26,506
EMEA
Disaggregation of Revenue [Line Items]
Revenue	$ 21,481	$ 21,726	$ 39,867	$ 40,096
Percent of Total	43.00%	48.00%	42.00%	46.00%
Americas
Disaggregation of Revenue [Line Items]
Revenue	$ 13,270	$ 11,416	$ 29,191	$ 23,540
Percent of Total	27.00%	25.00%	31.00%	27.00%
APAC
Disaggregation of Revenue [Line Items]
Revenue	$ 14,803	$ 12,552	$ 25,928	$ 24,022
Percent of Total	30.00%	27.00%	27.00%	27.00%
Hardware products
Disaggregation of Revenue [Line Items]
Revenue	$ 24,576	$ 25,256	$ 42,067	$ 47,000
Software licenses
Disaggregation of Revenue [Line Items]
Revenue	10,410	9,216	26,413	19,032
Subscription
Disaggregation of Revenue [Line Items]
Revenue	3,818	2,496	6,788	4,611
Professional services
Disaggregation of Revenue [Line Items]
Revenue	1,157	1,070	2,121	2,031
Maintenance, support and other
Disaggregation of Revenue [Line Items]
Revenue	$ 9,593	$ 7,656	$ 17,597	$ 14,984

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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

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-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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