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PREPAID EXPENSE AND OTHER CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
PREPAID EXPENSE AND OTHER CURRENT ASSETS | 5. PREPAID EXPENSE AND OTHER CURRENT ASSETS Prepaid expense and other current assets consist of the following:
|  | December 31, |
|  | 2017 |  |  | 2018 |
Spare parts |  | $ | 5,598,073 |  |  | $ | 5,011,781 |
Prepaid value added tax (“VAT”) |  |  | - |  |  |  | 4,768,552 |
Prepaid insurance fee |  |  | 285,650 |  |  |  | 153,751 |
Others |  |  | 805,900 |  |  |  | 401,417 |
Total |  | $ | 6,689,623 |  |  | $ | 10,335,501 |

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- Definition The entire disclosure for other current assets. + References No definition available. + Details
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