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REVENUE - Geographic Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 225,951 | $ 216,703 | $ 718,917 | $ 634,841
Percent of total revenue | 100.00% | 100.00% | 100.00% | 100.00%
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 120,971 | $ 123,447 | $ 436,199 | $ 347,120
Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10,737 | 11,748 | 35,009 | 49,450
United Kingdom (“U.K.”) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25,150 | 23,034 | 68,246 | 64,269
Europe (excluding U.K.), Middle East, and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 39,656 | 34,761 | 106,472 | 102,342
Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 29,437 | $ 23,713 | $ 72,991 | $ 71,660
Total revenue | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percent of total revenue | 53.00% | 57.00% | 61.00% | 55.00%
Total revenue | Other Americas |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percent of total revenue | 5.00% | 5.00% | 5.00% | 8.00%
Total revenue | United Kingdom (“U.K.”) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percent of total revenue | 11.00% | 11.00% | 9.00% | 10.00%
Total revenue | Europe (excluding U.K.), Middle East, and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percent of total revenue | 18.00% | 16.00% | 15.00% | 16.00%
Total revenue | Asia-Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percent of total revenue | 13.00% | 11.00% | 10.00% | 11.00%

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