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Statements of Stockholders' Equity - USD ($)
Total
Preferred Convertible Stock
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance at Dec. 31, 2015 $ (39,412,822) $ 5,968,549 $ 1,094,375       $ (46,475,746)
Beginning balance, shares at Dec. 31, 2015   6,244,174 665,842        
Stock-based compensation 298,535     $ 298,535      
Conversion of warrants 249,215     249,215      
Conversion of warrants, shares     127,143        
Exercise of stock options $ 137,403   $ 112,101 25,302      
Exercise of stock options, shares 58,155   58,155        
Effect of accretion to redemption value $ (1,356,707)     (547,750)     (808,957)
Change in par value from no par value to $0.0001     $ (1,206,391) 1,206,391      
Issuance of common stock upon initial public offering, net of issuance costs 10,816,978   $ 170 10,816,808      
Issuance of common stock upon initial public offering, net of issuance costs, shares     1,700,100        
Issuance of warrants to underwriters 126,218     126,218      
Conversion of preferred redeemable convertible stock to common stock upon initial public offering 44,463,613   $ 378 44,463,235      
Conversion of preferred redeemable convertible stock to common stock upon initial public offering, shares     3,778,753        
Conversion of preferred convertible stock to common stock upon initial public offering   $ (5,968,549) $ 126 5,968,423      
Conversion of preferred convertible stock to common stock upon initial public offering, shares   (6,244,174) 1,259,187        
Issuance of common stock upon secondary public offering, net of issuance costs 25,976,262   $ 169 25,976,093      
Issuance of common stock upon secondary public offering, net of issuance costs, shares     1,685,882        
Net income (loss) 3,733,707           3,733,707
Ending balance at Dec. 31, 2016 45,032,402   $ 928 88,582,470     (43,550,996)
Ending balance, shares at Dec. 31, 2016     9,275,062        
Stock-based compensation 736,066     736,066      
Exercise of stock options $ 588,482   $ 28 588,454      
Exercise of stock options, shares 284,455   284,455        
Shares issued pursuant to stock awards     $ 5 (5)      
Shares issued pursuant to stock awards, shares     57,475        
Common stock repurchases $ (1,257,100)       $ (1,257,100)    
Common stock repurchases, shares     (135,000)        
Reversal of costs related to secondary offering 781     781      
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (16,907)         $ (16,907)  
Net income (loss) 1,141,255           1,141,255
Ending balance at Dec. 31, 2017 46,224,979   $ 961 89,907,766 (1,257,100) (16,907) (42,409,741)
Ending balance, shares at Dec. 31, 2017     9,481,992        
Stock-based compensation 2,910,070     2,910,070      
Exercise of stock options $ 765,267   $ 34 765,233      
Exercise of stock options, shares 341,456   341,456        
Common stock repurchases $ (2,174,430)       (2,174,430)    
Common stock repurchases, shares     (222,314)        
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 5,766         5,766  
Net income (loss) (2,584,320)           (2,584,320)
Ending balance at Dec. 31, 2018 $ 45,147,332   $ 995 $ 93,583,069 $ (3,431,530) $ (11,141) $ (44,994,061)
Ending balance, shares at Dec. 31, 2018     9,601,134