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FINANCIAL STATEMENT SCHEDULE I (BALANCE SHEET) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
CURRENT ASSETS |  |  |  |
Cash and cash equivalents | $ 65,419,389 | $ 53,802,946 | $ 15,987,478 |
Prepaid expenses and other current assets | 10,335,501 | 6,689,623 |  |
Total current assets | 160,068,807 | 142,362,550 |  |
TOTAL ASSETS | 854,929,081 | 748,781,233 |  |
CURRENT LIABILITIES |  |  |  |
Accrued expenses and other current liabilities | 9,417,702 | 10,821,785 |  |
Total current liabilities | 149,853,934 | 216,511,379 |  |
EQUITY |  |  |  |
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2017 and 2018; 279,214,103 shares issued and 270,918,702 shares outstanding as of December 31, 2017; 351,823,578 shares issued and 332,029,752 shares outstanding as of December 31, 2018) | 33,439 | 27,328 |  |
Additional paid in capital | 368,681,449 | 247,076,428 |  |
Retained earnings | 171,398,185 | 133,273,480 |  |
Accumulated other comprehensive income (loss) | (13,232,560) | 13,107,187 |  |
Treasury shares, at cost (4,643,150 shares as of December 31, 2017 and 2018) | (1,748,836) | (1,748,836) |  |
Total shareholders' equity | 525,131,677 | 391,735,587 |  |
TOTAL LIABILITIES AND EQUITY | $ 854,929,081 | $ 748,781,233 |  |
Ordinary shares: |  |  |  |
Ordinary shares, par value | $ 0.0001 | $ 0.0001 |  |
Ordinary shares, shares authorized | 500,000,000 | 500,000,000 |  |
Ordinary shares, shares issued | 351,823,578 | 279,214,103 |  |
Ordinary shares, shares outstanding | 332,029,752 | 270,918,702 |  |
Treasury Stock, Shares | 4,643,150 | 4,643,150 |  |
Parent Company [Member] |  |  |  |
CURRENT ASSETS |  |  |  |
Cash and cash equivalents | $ 1,487,517 | $ 4,536,809 | $ 2,943,502 | $ 2,563,083
Prepaid expenses and other current assets | 186,641 | 700,064 |  |
Total current assets | 1,674,158 | 5,236,873 |  |
Investments in subsidiaries | 523,650,516 | 386,872,629 |  |
TOTAL ASSETS | 525,324,674 | 392,109,502 |  |
CURRENT LIABILITIES |  |  |  |
Accrued expenses and other current liabilities | 192,997 | 373,915 |  |
Total current liabilities | 192,997 | 373,915 |  |
EQUITY |  |  |  |
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2017 and 2018; 279,214,103 shares issued and 270,918,702 shares outstanding as of December 31, 2017; 351,823,578 shares issued and 332,029,752 shares outstanding as of December 31, 2018) | 33,439 | 27,328 |  |
Additional paid in capital | 368,681,449 | 247,076,428 |  |
Retained earnings | 171,398,185 | 133,273,480 |  |
Accumulated other comprehensive income (loss) | (13,232,560) | 13,107,187 |  |
Treasury shares, at cost (4,643,150 shares as of December 31, 2017 and 2018) | (1,748,836) | (1,748,836) |  |
Total shareholders' equity | 525,131,677 | 391,735,587 |  |
TOTAL LIABILITIES AND EQUITY | $ 525,324,674 | $ 392,109,502 |  |
Ordinary shares: |  |  |  |
Ordinary shares, par value | $ 0.0001 | $ 0.0001 |  |
Ordinary shares, shares authorized | 500,000,000 | 500,000,000 |  |
Ordinary shares, shares issued | 351,823,578 | 279,214,103 |  |
Ordinary shares, shares outstanding | 332,029,752 | 270,918,702 |  |
Treasury Stock, Shares | 4,643,150 | 4,643,150 |  |

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