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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 64,799 | $ 52,495 | $ 49,554 | $ 45,432 | $ 54,506 | $ 51,126 | $ 45,694 | $ 41,965 | $ 212,280 | $ 193,291 | $ 192,304
Percent of Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Transferred at a point in time |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 152,977 |  |
Transferred over time |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 59,303 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Amortization period for sales commissions (in years) |  |  |  |  |  |  |  |  | 7 years |  |
EMEA |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 103,293 | $ 92,859 | $ 95,897
Percent of Total |  |  |  |  |  |  |  |  | 49.00% | 48.00% | 50.00%
Americas |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 54,979 | $ 52,981 | $ 33,204
Percent of Total |  |  |  |  |  |  |  |  | 26.00% | 27.00% | 17.00%
APAC |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 54,008 | $ 47,451 | $ 63,203
Percent of Total |  |  |  |  |  |  |  |  | 25.00% | 25.00% | 33.00%
Hardware products |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 105,560 | $ 105,867 | $ 126,198
Software licenses |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 47,417 | 41,390 | 29,859
Subscription |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,426 | 10,296 | 7,301
Professional services |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,743 | 4,891 | 4,681
Maintenance, support and other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 38,134 | $ 30,847 | $ 24,265

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