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FINANCIAL STATEMENT SCHEDULE I (BALANCE SHEET) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CURRENT ASSETS        
Cash and cash equivalents $ 65,419,389 $ 53,802,946 $ 15,987,478  
Prepaid expenses and other current assets 10,335,501 6,689,623    
Total current assets 160,068,807 142,362,550    
TOTAL ASSETS 854,929,081 748,781,233    
CURRENT LIABILITIES        
Accrued expenses and other current liabilities 9,417,702 10,821,785    
Total current liabilities 149,853,934 216,511,379    
EQUITY        
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2017 and 2018; 279,214,103 shares issued and 270,918,702 shares outstanding as of December 31, 2017; 351,823,578 shares issued and 332,029,752 shares outstanding as of December 31, 2018) 33,439 27,328    
Additional paid in capital 368,681,449 247,076,428    
Retained earnings 171,398,185 133,273,480    
Accumulated other comprehensive income (loss) (13,232,560) 13,107,187    
Treasury shares, at cost (4,643,150 shares as of December 31, 2017 and 2018) (1,748,836) (1,748,836)    
Total shareholders' equity 525,131,677 391,735,587    
TOTAL LIABILITIES AND EQUITY $ 854,929,081 $ 748,781,233    
Ordinary shares:        
Ordinary shares, par value $ 0.0001 $ 0.0001    
Ordinary shares, shares authorized 500,000,000 500,000,000    
Ordinary shares, shares issued 351,823,578 279,214,103    
Ordinary shares, shares outstanding 332,029,752 270,918,702    
Treasury Stock, Shares 4,643,150 4,643,150    
Parent Company [Member]        
CURRENT ASSETS        
Cash and cash equivalents $ 1,487,517 $ 4,536,809 $ 2,943,502 $ 2,563,083
Prepaid expenses and other current assets 186,641 700,064    
Total current assets 1,674,158 5,236,873    
Investments in subsidiaries 523,650,516 386,872,629    
TOTAL ASSETS 525,324,674 392,109,502    
CURRENT LIABILITIES        
Accrued expenses and other current liabilities 192,997 373,915    
Total current liabilities 192,997 373,915    
EQUITY        
Ordinary shares ($0.0001 par value 500,000,000 shares authorized as of December 31, 2017 and 2018; 279,214,103 shares issued and 270,918,702 shares outstanding as of December 31, 2017; 351,823,578 shares issued and 332,029,752 shares outstanding as of December 31, 2018) 33,439 27,328    
Additional paid in capital 368,681,449 247,076,428    
Retained earnings 171,398,185 133,273,480    
Accumulated other comprehensive income (loss) (13,232,560) 13,107,187    
Treasury shares, at cost (4,643,150 shares as of December 31, 2017 and 2018) (1,748,836) (1,748,836)    
Total shareholders' equity 525,131,677 391,735,587    
TOTAL LIABILITIES AND EQUITY $ 525,324,674 $ 392,109,502    
Ordinary shares:        
Ordinary shares, par value $ 0.0001 $ 0.0001    
Ordinary shares, shares authorized 500,000,000 500,000,000    
Ordinary shares, shares issued 351,823,578 279,214,103    
Ordinary shares, shares outstanding 332,029,752 270,918,702    
Treasury Stock, Shares 4,643,150 4,643,150