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CREDIT RISK AND CONCENTRATION (Tables) | 12 Months Ended
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Dec. 31, 2017
CREDIT RISK AND CONCENTRATION |
Schedule of customers accounted for 10% or more of the Company's net revenues |
|  | For the years ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Softbank and affiliates |  | 40 | % | 50 | % | 47 | %
Bharat Sanchar Nigam Ltd. and affiliates |  | 39 | % | 35 | % | 17 | %

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