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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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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + 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 -Subparagraph (a) -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 -Subparagraph (a) -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 + Details
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