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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, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING ACTIVITIES        
Net income   $ 29,524,392 $ 38,124,705 $ 92,841,128
Share-based compensation   17,896,942 13,788,049 4,200,273
Adjustments to reconcile net income to net cash used in operating activities:        
Prepaid expenses and other current assets   (5,174,161) (4,699,699) 496,485
Accrued expense and other current liabilities   2,943,201 (918,399) 4,581,224
Net cash provided by operating activities   180,990,569 95,553,040 142,704,394
INVESTING ACTIVITIES        
Net cash used in investing activities   (261,827,713) (164,720,305) (67,900,571)
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   791,493 686,596 2,238,854
Net cash (used in) provided by financing activities   102,327,088 86,711,890 (37,354,319)
Net increase in cash, cash equivalents and restricted cash   20,174,209 22,453,722 40,785,219
Cash, cash equivalents and restricted cash at the beginning of the year (includes $3,723,807, $8,952,260 and $1,091,190 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2016, 2017 and 2018)   95,119,886 72,666,164 31,880,945
Cash, cash equivalents and restricted cash at the end of the year (includes $8,952,260, $1,091,190 and $845,199 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2017, 2018 and 2019)   115,294,095 95,119,886 72,666,164
Parent Company [Member]        
OPERATING ACTIVITIES        
Net income   29,524,392 38,124,705 92,841,128
Equity in earnings of subsidiaries   (41,478,799) (52,348,801) (97,828,948)
Adjustments to reconcile net income to net cash used in operating activities:        
Net cash provided by operating activities   (932,827) (578,770) (645,547)
INVESTING ACTIVITIES        
Capital contributed to subsidiaries   0 (109,778,761) 0
Net cash used in investing activities   0 (109,778,761) 0
FINANCING ACTIVITIES        
Proceeds from follow-on equity offering   0 113,540,845 0
Insurance cost for follow-on equity offering   0 (6,919,202) 0
Proceeds from options exercised   791,493 686,596 2,238,854
Net cash (used in) provided by financing activities   791,493 107,308,239 2,238,854
Net increase in cash, cash equivalents and restricted cash   (141,334) (3,049,292) 1,593,307
Cash, cash equivalents and restricted cash at the beginning of the year (includes $3,723,807, $8,952,260 and $1,091,190 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2016, 2017 and 2018)   1,487,517 4,536,809 2,943,502
Cash, cash equivalents and restricted cash at the end of the year (includes $8,952,260, $1,091,190 and $845,199 of cash, cash equivalents and restricted cash in current assets associated with discontinued operations on December 31, 2017, 2018 and 2019)   $ 1,346,183 $ 1,487,517 $ 4,536,809