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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, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES        
Net income   $ 38,124,705 $ 92,841,128 $ 43,493,756
Share-based compensation   13,788,049 4,200,273 2,702,089
Adjustments to reconcile net income to net cash used in operating activities:        
Prepaid expenses and other current assets   (4,699,699) 496,485 2,895,291
Accrued expense and other current liabilities   (918,399) 4,581,224 805,730
Income tax payable   (7,314,062) 7,253,601 4,420,313
Net cash provided by operating activities   95,553,040 142,704,394 98,671,937
INVESTING ACTIVITIES        
Net cash used in investing activities   (164,720,305) (67,900,571) (68,060,723)
FINANCING ACTIVITIES        
Proceeds from follow-on equity offering   113,540,845
Insurance cost for follow-on equity offering $ (6,900,000) (6,919,202)
Proceeds from options exercised   686,596 2,238,854 1,051,586
Net cash provided by (used in) financing activities   86,711,890 (37,354,319) (30,279,523)
Net increase (decrease) in cash, cash equivalents and restricted cash   22,453,722 40,785,219 (1,671,779)
Cash, cash equivalents and restricted cash at the beginning of the year   53,802,946 15,987,478  
Cash and cash equivalents   65,419,389 53,802,946 15,987,478
Parent Company [Member]        
OPERATING ACTIVITIES        
Net income   38,124,705 92,841,128 43,493,756
Equity in earnings of subsidiaries   (52,348,801) (97,828,948) (46,669,238)
Share-based compensation   13,788,049 4,200,273 2,702,089
Adjustments to reconcile net income to net cash used in operating activities:        
Prepaid expenses and other current assets   (62,305) 50,059 (29,976)
Accrued expense and other current liabilities   (80,418) 91,941 (58,806)
Income tax payable   0 0 (108,992)
Net cash provided by operating activities   (578,770) (645,547) (671,167)
INVESTING ACTIVITIES        
Capital contributed to subsidiaries   (109,778,761) 0 0
Net cash used in investing activities   (109,778,761) 0 0
FINANCING ACTIVITIES        
Proceeds from follow-on equity offering   113,540,845 0 0
Insurance cost for follow-on equity offering   (6,919,202) 0 0
Proceeds from options exercised   686,596 2,238,854 1,051,586
Net cash provided by (used in) financing activities   107,308,239 2,238,854 1,051,586
Net increase (decrease) in cash, cash equivalents and restricted cash   (3,049,292) 1,593,307 380,419
Cash, cash equivalents and restricted cash at the beginning of the year   4,536,809 2,943,502 2,563,083
Cash and cash equivalents   $ 1,487,517 $ 4,536,809 $ 2,943,502