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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment customer | Dec. 31, 2015 USD ($) customer | Dec. 31, 2014 USD ($) customer
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Revenues | $ 55,343 | $ 61,040 | $ 65,835 | $ 63,675 | $ 50,841 | $ 61,534 | $ 60,479 | $ 59,580 | $ 245,893 | $ 232,434 | $ 249,682
Identifiable assets | 179,919 |  |  |  | 162,147 |  |  |  | $ 179,919 | $ 162,147 |
Sales | Customer A |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  | 1 | 1 | 1
Percentage of concentration risk |  |  |  |  |  |  |  |  | 19.00% | 24.00% | 23.00%
Trade receivables | Customer A |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 1 | 1
Percentage of concentration risk |  |  |  |  |  |  |  |  |  | 12.00% | 23.00%
Trade receivables | Customer B |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  | 1 | 1
Percentage of concentration risk |  |  |  |  |  |  |  |  |  | 15.00% | 15.00%
Outside the United States |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 111,993 | $ 80,029 | $ 85,152
Identifiable assets | $ 73,378 |  |  |  | $ 56,444 |  |  |  | 73,378 | 56,444 |
Wholly owned international subsidiaries |  |  |  |  |  |  |  |  |  |  |
Segment information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 99,061 | $ 77,509 | $ 82,544

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