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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, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES          
Net (loss) income     $ 43,493,756 $ 12,956,889 $ 16,649,176
Share-based compensation     2,702,089 3,687,951 1,792,819
Adjustments to reconcile net income to net cash used in operating activities:          
Prepaid expenses and other current assets     3,415,637 30,465 10,217,835
Amount due to a related party     1,815,307 2,178,445 (453,075)
Income tax payable     4,420,313 940,732
Net cash provided by operating activities     98,671,937 66,426,213 45,619,729
INVESTING ACTIVITIES          
Disposition of minority interest in subsidiary     5,110,085
Net cash used in investing activities     (66,123,053) (74,132,349) (90,589,032)
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     1,051,586 275,783 37,080
Net cash provided by (used in) financing activities     (30,279,523) 15,242,079 44,271,754
Net increase (decrease) in cash and cash equivalents     1,497,467 7,421,528 (762,601)
Cash and cash equivalents at the beginning of the year     14,490,011 7,068,483 7,831,084
Cash and cash equivalents at the end of the year     15,987,478 14,490,011 7,068,483
Parent Company [Member]          
OPERATING ACTIVITIES          
Net (loss) income     43,493,756 12,956,889 16,649,176
Share of results of subsidiaries     (46,669,238) (17,088,195) (19,391,427)
Share-based compensation     2,702,089 3,687,951 1,792,819
Adjustments to reconcile net income to net cash used in operating activities:          
Prepaid expenses and other current assets     (29,976) 11,099 (27,195)
Changes in other current liabilities     (58,806) (96,166) (26,901)
Amount due to a related party     (286,526) 286,526
Income tax payable     (108,992) 108,992
Net cash provided by operating activities     (671,167) (705,956) (717,002)
INVESTING ACTIVITIES          
Capital contributed to subsidiaries     (33,256,774) (54,638,421)
Cash collected from subsidiaries when liquidation    
Disposition of minority interest in subsidiary     5,110,085
Net cash used in investing activities     (28,146,689) (54,638,421)
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     1,051,586 275,783 37,080
Net cash provided by (used in) financing activities     1,051,586 26,922,578 54,661,527
Net increase (decrease) in cash and cash equivalents     380,419 (1,930,067) (693,896)
Cash and cash equivalents at the beginning of the year     2,563,083 4,493,150 5,187,046
Cash and cash equivalents at the end of the year     $ 2,943,502 $ 2,563,083 $ 4,493,150