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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

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