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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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