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Revenue - Disaggregation of revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 181,167 |  |  |  | $ 172,378 |  |  |  | $ 181,167 | $ 172,378 |  |
Revenue | $ 71,003 | $ 79,725 | $ 56,234 | $ 47,608 | $ 64,799 | $ 52,495 | $ 49,554 | $ 45,432 | $ 254,570 | $ 212,280 | $ 193,291 |
Percent of Total |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00% |
Products and Licenses transferred at a point in time |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 184,173 | $ 152,977 |  |
Services transferred over time |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 70,397 | 59,303 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Amortization period for sales commissions (in years) |  |  |  |  |  |  |  |  | 7 years |  |  |
EMEA |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 147,027 | $ 103,293 | $ 92,859 |
Percent of Total |  |  |  |  |  |  |  |  | 58.00% | 49.00% | 48.00% |
Americas |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 61,577 | $ 54,979 | $ 52,981 |
Percent of Total |  |  |  |  |  |  |  |  | 24.00% | 26.00% | 27.00% |
APAC |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 45,966 | $ 54,008 | $ 47,451 |
Percent of Total |  |  |  |  |  |  |  |  | 18.00% | 25.00% | 25.00% |
Hardware products |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 127,005 | $ 105,560 | $ 105,867 |
Software licenses |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 57,168 | 47,417 | 41,390 |
Subscription |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,250 | 15,426 | 10,296 |
Professional services |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,759 | 5,743 | 4,891 |
Maintenance, support and other |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 42,388 | $ 38,134 | $ 30,847 |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 11,900

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