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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CASH FLOWS) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
May. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities:          
Net income (loss)     $ 12,956,889 $ 16,649,176 $ (70,943,484)
Share-based compensation     3,687,951 1,792,819 1,881,401
Adjustments to reconcile net income to net cash used in operating activities:          
Prepaid expenses and other current assets     30,465 10,217,835 29,616
Amount due to related parties     2,178,445 $ (453,075) (415,960)
Income tax payable     940,732 (160,480)
Amount due from related party     5,481,362 $ 2,193,604 (6,853,965)
Net cash (used in) provided by operating activities     66,426,213 $ 45,619,729 $ (16,525,817)
Investing activities:          
Disposition of minority interest in subsidiary     5,110,085
Net cash used in investing activities     (74,132,349) $ (90,589,032) $ (30,696,113)
Financing activities:          
Repurchase of ordinary shares     (1,350,164)
Proceeds from follow-on equity offering     30,030,000 $ 58,000,000
Insurance cost for follow-on equity offering $ (2,000,000) $ (3,400,000) (2,033,041) (3,375,553)
Proceeds from options exercised     275,783 37,080 $ 135,171
Net cash provided by financing activities     15,242,079 44,271,754 48,826,684
Net increase (decrease) in cash and cash equivalents     7,421,528 (762,601) 1,152,060
Cash and cash equivalents at the beginning of the year     7,068,483 7,831,084 6,679,024
Cash and cash equivalents at the end of the year     14,490,011 7,068,483 7,831,084
Parent Company [Member]          
Operating activities:          
Net income (loss)     12,956,889 16,649,176 (70,943,484)
Share of results of subsidiaries     (17,088,195) (19,391,427) 67,890,514
Share-based compensation     3,687,951 1,792,819 1,881,401
Adjustments to reconcile net income to net cash used in operating activities:          
Prepaid expenses and other current assets     11,099 (27,195) 344,717
Changes in other current liabilities     (96,166) (26,901) $ 137,390
Amount due to related parties     (286,526) $ 286,526
Income tax payable     108,992
Net cash (used in) provided by operating activities     (705,956) $ (717,002) $ (689,462)
Investing activities:          
Capital contributed to subsidiaries     $ (33,256,774) $ (54,638,421)
Cash collected from subsidiaries when liquidation     $ 71,503
Disposition of minority interest in subsidiary     $ 5,110,085
Net cash used in investing activities     (28,146,689) $ (54,638,421) $ 71,503
Financing activities:          
Repurchase of ordinary shares     (1,350,164)
Proceeds from follow-on equity offering     30,030,000 $ 58,000,000
Insurance cost for follow-on equity offering     (2,033,041) (3,375,553)
Proceeds from options exercised     275,783 37,080 $ 135,171
Net cash provided by financing activities     26,922,578 54,661,527 135,171
Net increase (decrease) in cash and cash equivalents     (1,930,067) (693,896) (482,788)
Cash and cash equivalents at the beginning of the year     4,493,150 5,187,046 5,669,834
Cash and cash equivalents at the end of the year     $ 2,563,083 $ 4,493,150 $ 5,187,046