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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CASH FLOWS) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES        
Net income   $ 92,841,128 $ 43,493,756 $ 12,956,889
Share-based compensation   4,200,273 2,702,089 3,687,951
Adjustments to reconcile net income to net cash used in operating activities:        
Prepaid expenses and other current assets   898,903 3,415,637 30,465
Amount due to a related party   849,447 1,815,307 2,178,445
Income tax payable   7,253,601 4,420,313 940,732
Amount due from related party   (6,739,322) (1,318,195) 5,481,362
Net cash provided by operating activities   142,704,394 98,671,937 66,426,213
INVESTING ACTIVITIES        
Disposition of minority interest in subsidiary   5,110,085
Net cash used in investing activities   (63,109,224) (66,123,053) (74,132,349)
FINANCING ACTIVITIES        
Repurchase of ordinary shares   (1,350,164)
Proceeds from follow-on equity offering   30,030,000
Insurance cost for follow-on equity offering $ (2,000,000) (2,033,041)
Proceeds from options exercised   2,238,854 1,051,586 275,783
Net cash provided by (used in) financing activities   (37,354,319) (30,279,523) 15,242,079
Net increase in cash and cash equivalents   44,689,127 1,497,467 7,421,528
Cash and cash equivalents at the beginning of the year   15,987,478 14,490,011 7,068,483
Cash and cash equivalents at the end of the year   60,676,605 15,987,478 14,490,011
Parent Company [Member]        
OPERATING ACTIVITIES        
Net income   92,841,128 43,493,756 12,956,889
Equity in earnings of subsidiaries   (97,828,948) (46,669,238) (17,088,195)
Share-based compensation   4,200,273 2,702,089 3,687,951
Adjustments to reconcile net income to net cash used in operating activities:        
Prepaid expenses and other current assets   50,059 (29,976) 11,099
Changes in other current liabilities   91,941 (58,806) (96,166)
Amount due to a related party     0 (286,526)
Income tax payable   0 (108,992) 108,992
Amount due from related party      
Net cash provided by operating activities   (645,547) (671,167) (705,956)
INVESTING ACTIVITIES        
Capital contributed to subsidiaries   0 (33,256,774)
Disposition of minority interest in subsidiary   0 5,110,085
Net cash used in investing activities     0 (28,146,689)
FINANCING ACTIVITIES        
Repurchase of ordinary shares   0 (1,350,164)
Proceeds from follow-on equity offering   0 30,030,000
Insurance cost for follow-on equity offering   0 (2,033,041)
Proceeds from options exercised   2,238,854 1,051,586 275,783
Net cash provided by (used in) financing activities   2,238,854 1,051,586 26,922,578
Net increase in cash and cash equivalents   1,593,307 380,419 (1,930,067)
Cash and cash equivalents at the beginning of the year   2,943,502 2,563,083 4,493,150
Cash and cash equivalents at the end of the year   $ 4,536,809 $ 2,943,502 $ 2,563,083