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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CHANGES IN EQUITY) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 394,528,067 $ 271,728,922 $ 241,656,490
Net income   38,124,705 92,841,128 43,493,756
Share-based compensation   13,788,049 4,200,273 2,702,089
Option Exercised   $ 110,868 2,765,418 1,051,586
Option Exercised, shares   230,225    
Follow-on equity offering, net of issuance costs of $6,919,202 $ 106,600,000 $ 106,621,643    
Follow-on equity offering, net of issuance costs of $6,919,202, Shares 51,609,475      
Restricted shares vested    
Acquisition of non-controlling interest   (2,326,081)    
Balance   525,131,677 394,528,067 271,728,922
Ordinary shares [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 27,328 $ 26,532 $ 26,320
Balance, shares   270,918,702 262,956,278 260,836,578
Share-based compensation  
Option Exercised   $ 23 $ 560 $ 212
Option Exercised, shares   230,225 5,596,050 2,119,700
Follow-on equity offering, net of issuance costs of $6,919,202   $ 5,161    
Follow-on equity offering, net of issuance costs of $6,919,202, Shares   51,609,475    
Restricted shares vested   $ 927 $ 236  
Restricted shares vested, Shares   9,271,350 2,366,374  
Acquisition of non-controlling interest      
Balance   $ 33,439 $ 27,328 $ 26,532
Balance, shares   332,029,752 270,918,702 262,956,278
Treasury Stock [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ (1,748,836) $ (1,748,836) $ (1,748,836)
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $6,919,202      
Restricted shares vested    
Acquisition of non-controlling interest      
Balance   (1,748,836) (1,748,836) (1,748,836)
Additional paid-in capital [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   247,076,428 240,111,533 236,358,070
Share-based compensation   13,788,049 4,200,273 2,702,089
Option Exercised   110,845 2,764,858 1,051,374
Follow-on equity offering, net of issuance costs of $6,919,202   106,616,482    
Restricted shares vested   (927) (236)  
Acquisition of non-controlling interest   1,090,572    
Balance   368,681,449 247,076,428 240,111,533
Retained earnings (accumulated losses) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   133,273,480 40,432,352 (3,061,404)
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $6,919,202      
Restricted shares vested    
Acquisition of non-controlling interest      
Balance   171,398,185 133,273,480 40,432,352
Accumulated other comprehensive income (loss) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   13,107,187 (8,721,820) 8,780,313
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $6,919,202      
Restricted shares vested    
Acquisition of non-controlling interest   (123,668)    
Balance   (13,232,560) 13,107,187 (8,721,820)
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   391,735,587 270,099,761 240,354,463
Net income   38,124,705 92,841,128 43,493,756
Other comprehensive loss   (26,216,079) 21,829,007 (17,502,133)
Share-based compensation   13,788,049 4,200,273 2,702,089
Option Exercised   110,868 $ 2,765,418 1,051,586
Follow-on equity offering, net of issuance costs of $6,919,202   $ 106,621,643    
Restricted shares vested, Shares   0 0  
Acquisition of non-controlling interest   $ 966,904    
Balance   525,131,677 $ 391,735,587 270,099,761
Parent Company [Member] | Ordinary shares [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 27,328 $ 26,532 $ 26,320
Balance, shares   270,918,702 262,956,278 260,836,578
Net income   $ 0 $ 0 $ 0
Other comprehensive loss   0 0 0
Share-based compensation   0 0 0
Option Exercised   $ 23 $ 560 $ 212
Option Exercised, shares   230,225 5,596,050 2,119,700
Follow-on equity offering, net of issuance costs of $6,919,202   $ 5,161    
Follow-on equity offering, net of issuance costs of $6,919,202, Shares   51,609,475    
Restricted shares vested   $ 927 $ 236  
Restricted shares vested, Shares   9,271,350 2,366,374  
Acquisition of non-controlling interest   $ 0    
Balance   $ 33,439 $ 27,328 $ 26,532
Balance, shares   332,029,752 270,918,702 262,956,278
Parent Company [Member] | Treasury Stock [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ (1,748,836) $ (1,748,836) $ (1,748,836)
Net income   0 0 0
Other comprehensive loss   0 0 0
Share-based compensation   0 0 0
Option Exercised   $ 0 $ 0 0
Follow-on equity offering, net of issuance costs of $6,919,202, Shares   0    
Restricted shares vested, Shares   0 0  
Acquisition of non-controlling interest   $ 0    
Balance   (1,748,836) $ (1,748,836) (1,748,836)
Parent Company [Member] | Additional paid-in capital [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   247,076,428 240,111,533 236,358,070
Net income   0 0 0
Other comprehensive loss   0 0 0
Share-based compensation   13,788,049 4,200,273 2,702,089
Option Exercised   110,845 2,764,858 1,051,374
Follow-on equity offering, net of issuance costs of $6,919,202   $ 106,616,482    
Restricted shares vested     (236)  
Restricted shares vested, Shares   (927)    
Acquisition of non-controlling interest   $ 1,090,572    
Balance   368,681,449 247,076,428 240,111,533
Parent Company [Member] | Retained earnings (accumulated losses) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   133,273,480 40,432,352 (3,061,404)
Net income   38,124,705 92,841,128 43,493,756
Other comprehensive loss   0 0 0
Share-based compensation   0 0 0
Option Exercised   $ 0 $ 0 0
Follow-on equity offering, net of issuance costs of $6,919,202, Shares   0    
Restricted shares vested, Shares   0 0  
Acquisition of non-controlling interest   $ 0    
Balance   171,398,185 $ 133,273,480 40,432,352
Parent Company [Member] | Accumulated other comprehensive income (loss) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   13,107,187 (8,721,820) 8,780,313
Net income   0 0 0
Other comprehensive loss   (26,216,079) 21,829,007 (17,502,133)
Share-based compensation   0 0 0
Option Exercised   $ 0 $ 0 0
Follow-on equity offering, net of issuance costs of $6,919,202, Shares   0    
Restricted shares vested, Shares   0 0  
Acquisition of non-controlling interest   $ (123,668)    
Balance   $ (13,232,560) $ 13,107,187 $ (8,721,820)