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CHANGES TO STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
Total
Common Stock - Voting
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Treasury Stock
BALANCES at Dec. 31, 2017 $ 116,902,978 $ 35,132 $ 312,783,195 $ (195,991,478) $ 76,129  
Shares, Outstanding at Dec. 31, 2017   35,132,548        
Exercise of options to purchase common stock 53,862 $ 7 53,855      
Exercise of options to purchase common stock, shares   6,696        
Share-based compensation expense 1,092,260   1,092,260      
Foreign Currency Translation 199,554       199,554  
Net income (loss) (3,520,937)     (3,520,937)    
BALANCES at Mar. 31, 2018 114,727,717 $ 35,139 313,929,310 (199,512,415) 275,683  
Shares, Outstanding at Mar. 31, 2018   35,139,244        
BALANCES at Dec. 31, 2017 116,902,978 $ 35,132 312,783,195 (195,991,478) 76,129  
Shares, Outstanding at Dec. 31, 2017   35,132,548        
Foreign Currency Translation (55,958)          
BALANCES at Sep. 30, 2018 116,804,693 $ 35,524 320,115,324 (203,110,100) 20,171 $ (256,226)
Shares, Outstanding at Sep. 30, 2018   35,524,330       14,169
BALANCES at Mar. 31, 2018 114,727,717 $ 35,139 313,929,310 (199,512,415) 275,683  
Shares, Outstanding at Mar. 31, 2018   35,139,244        
Exercise of options to purchase common stock 945,428 $ 104 945,324      
Exercise of options to purchase common stock, shares   103,693        
Issuance of restricted stock units (256,226) $ 75 (75)     $ (256,226)
Issuance of restricted stock units, shares   74,583       14,169
Share-based compensation expense 1,301,774   1,301,774      
Foreign Currency Translation (201,187)       (201,187)  
Net income (loss) (3,500,519)     (3,500,519)    
BALANCES at Jun. 30, 2018 113,016,986 $ 35,317 316,176,333 (203,012,934) 74,496 $ (256,226)
Shares, Outstanding at Jun. 30, 2018   35,317,520       14,169
Exercise of options to purchase common stock 2,072,594 $ 207 2,072,387      
Exercise of options to purchase common stock, shares   206,810        
Share-based compensation expense 1,866,604   1,866,604      
Foreign Currency Translation (54,325)       (54,325)  
Net income (loss) (97,166)     (97,166)    
BALANCES at Sep. 30, 2018 116,804,693 $ 35,524 320,115,324 (203,110,100) 20,171 $ (256,226)
Shares, Outstanding at Sep. 30, 2018   35,524,330       14,169
BALANCES at Dec. 31, 2018 121,474,475 $ 35,556 323,079,437 (201,352,682) (31,610) $ (256,226)
Shares, Outstanding at Dec. 31, 2018   35,556,595       14,169
Exercise of options to purchase common stock 1,791,668 $ 248 1,791,420      
Exercise of options to purchase common stock, shares   248,195        
Issuance of restricted stock units (673,774) $ 62 (673,836)      
Issuance of restricted stock units, shares   61,532        
Share-based compensation expense 1,260,126   1,260,126      
Foreign Currency Translation 91,047       91,047  
Net income (loss) (3,422,000)     (3,422,000)    
BALANCES at Mar. 31, 2019 120,521,542 $ 35,866 325,457,147 (204,774,682) 59,437 $ (256,226)
Shares, Outstanding at Mar. 31, 2019   35,866,322       14,169
BALANCES at Dec. 31, 2018 121,474,475 $ 35,556 323,079,437 (201,352,682) (31,610) $ (256,226)
Shares, Outstanding at Dec. 31, 2018   35,556,595       14,169
Foreign Currency Translation (143,941)          
BALANCES at Sep. 30, 2019 123,773,968 $ 36,100 331,538,514 (207,368,869) (175,551) $ (256,226)
Shares, Outstanding at Sep. 30, 2019   36,100,662       14,169
BALANCES at Mar. 31, 2019 120,521,542 $ 35,866 325,457,147 (204,774,682) 59,437 $ (256,226)
Shares, Outstanding at Mar. 31, 2019   35,866,322       14,169
Exercise of options to purchase common stock 1,983,879 $ 194 1,983,685      
Exercise of options to purchase common stock, shares   194,497        
Issuance of restricted stock units (579,178) $ 29 (579,207)      
Issuance of restricted stock units, shares   29,126        
Share-based compensation expense 1,480,882   1,480,882      
Foreign Currency Translation (153,321)       (153,321)  
Net income (loss) (5,661,350)     (5,661,350)    
BALANCES at Jun. 30, 2019 117,592,454 $ 36,089 328,342,507 (210,436,032) (93,884) $ (256,226)
Shares, Outstanding at Jun. 30, 2019   36,089,945       14,169
Exercise of options to purchase common stock 66,370 $ 11 66,359      
Exercise of options to purchase common stock, shares   10,717        
Share-based compensation expense 3,129,648   3,129,648      
Foreign Currency Translation (81,667)       (81,667)  
Net income (loss) 3,067,163     3,067,163    
BALANCES at Sep. 30, 2019 $ 123,773,968 $ 36,100 $ 331,538,514 $ (207,368,869) $ (175,551) $ (256,226)
Shares, Outstanding at Sep. 30, 2019   36,100,662       14,169