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FINANCIAL STATEMENT SCHEDULE I (BALANCE SHEET) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
CURRENT ASSETS |  |  |  |
Cash and cash equivalents | $ 60,676,605 | $ 15,987,478 | $ 14,490,011 | $ 7,068,483
Prepaid expenses and other current assets | 8,182,567 | 8,027,667 |  |
Total current assets | 142,362,550 | 73,302,858 |  |
TOTAL ASSETS | 748,781,233 | 656,708,076 |  |
CURRENT LIABILITIES |  |  |  |
Accrued expenses and other current liabilities | 16,134,408 | 8,320,041 |  |
Total current liabilities | 216,511,379 | 249,750,421 |  |
EQUITY |  |  |  |
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2016 and 2017; 279,214,103 and 279,214,103 shares issued as of December 31, 2016 and 2017, respectively and 262,956,278 and 270,918,702 shares outstanding as of December 31, 2016 and 2017, respectively) | 27,328 | 26,532 |  |
Additional paid in capital | 247,076,428 | 240,111,533 |  |
Retained earnings | 133,273,480 | 40,432,352 |  |
Accumulated other comprehensive income (loss) | 13,107,187 | (8,721,820) |  |
Treasury shares | (1,748,836) | (1,748,836) |  |
Total shareholders' equity | 391,735,587 | 270,099,761 |  |
TOTAL LIABILITIES AND EQUITY | $ 748,781,233 | $ 656,708,076 |  |
Ordinary shares: |  |  |  |
Ordinary shares, par value | $ 0.0001 | $ 0.0001 |  |
Ordinary shares, shares authorized | 500,000,000 | 500,000,000 |  |
Ordinary shares, shares issued | 279,214,103 | 279,214,103 |  |
Ordinary shares, shares outstanding | 270,918,702 | 262,956,278 |  |
Parent Company [Member] |  |  |  |
CURRENT ASSETS |  |  |  |
Cash and cash equivalents | $ 4,536,809 | $ 2,943,502 | $ 2,563,083 | $ 4,493,150
Prepaid expenses and other current assets | 700,064 | 223,559 |  |
Total current assets | 5,236,873 | 3,167,061 |  |
Investments in subsidiaries | 386,872,629 | 267,322,549 |  |
TOTAL ASSETS | 392,109,502 | 270,489,610 |  |
CURRENT LIABILITIES |  |  |  |
Accrued expenses and other current liabilities | 373,915 | 389,849 |  |
Total current liabilities | 373,915 | 389,849 |  |
EQUITY |  |  |  |
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2016 and 2017; 279,214,103 and 279,214,103 shares issued as of December 31, 2016 and 2017, respectively and 262,956,278 and 270,918,702 shares outstanding as of December 31, 2016 and 2017, respectively) | 27,328 | 26,532 |  |
Additional paid in capital | 247,076,428 | 240,111,533 |  |
Retained earnings | 133,273,480 | 40,432,352 |  |
Accumulated other comprehensive income (loss) | 13,107,187 | (8,721,820) |  |
Treasury shares | (1,748,836) | (1,748,836) |  |
Total shareholders' equity | 391,735,587 | 270,099,761 |  |
TOTAL LIABILITIES AND EQUITY | $ 392,109,502 | $ 270,489,610 |  |
Ordinary shares: |  |  |  |
Ordinary shares, par value | $ 0.0001 | $ 0.0001 |  |
Ordinary shares, shares authorized | 500,000,000 | 500,000,000 |  |
Ordinary shares, shares issued | 279,214,103 | 279,214,103 |  |
Ordinary shares, shares outstanding | 269,686,178 | 262,956,278 |  |

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