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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

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