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v3.19.1

SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Disaggregation of revenue | $ 73,962 | $ 80,092 | $ 79,981 | $ 76,576 | $ 65,355 | $ 64,968 | $ 60,335 | $ 61,354 | $ 310,611 | $ 252,012 | $ 245,893
Identifiable assets | 285,301 |  |  |  | 187,922 |  |  |  | $ 285,301 | $ 187,922 |
Total Revenue |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration risk |  |  |  |  |  |  |  |  | 19.00% | 18.00% | 19.00%
Trade receivables |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Percentage of concentration risk |  |  |  |  |  |  |  |  | 13.00% | 15.00% |
Outside the United States |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | $ 146,835 | $ 119,212 | $ 111,993
Identifiable assets | $ 88,400 |  |  |  | $ 84,652 |  |  |  | 88,400 | 84,652 |
Wholly owned foreign subsidiaries |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenue |  |  |  |  |  |  |  |  | $ 126,104 | $ 107,039 | $ 99,061

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