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Statements of Stockholders' Equity (Deficit) - USD ($)
Total
Preferred Convertible Stock
Common Stock
Additional Paid-in Capital
Treasury Stock
Note to Employee
Accumulated Deficit
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2014 $ (37,670,138) $ 5,968,549 $ 1,017,003     $ (266,282) $ (44,389,408)  
Beginning balance, shares at Dec. 31, 2014   6,244,174 625,282          
Stock-based compensation 341,554     $ 341,554        
Shares issued pursuant to stock awards, shares     16,300          
Exercise of stock options $ 77,372   $ 77,372          
Exercise of stock options, shares 24,260   24,260          
Change in note to employee $ 266,282         $ 266,282    
Effect of accretion to redemption value (2,157,550)     (341,554)     (1,815,996)  
Net income (loss) (270,342)           (270,342)  
Ending balance at Dec. 31, 2015 (39,412,822) $ 5,968,549 $ 1,094,375       (46,475,746)  
Ending 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        
Shares issued pursuant to stock awards     $ 5 (5)        
Shares issued pursuant to stock awards, shares     57,475          
Exercise of stock options $ 588,482   $ 28 588,454        
Exercise of stock options, shares 284,455   284,455          
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 loss on available-for-sale securities (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)   $ (42,409,741) $ (16,907)
Ending balance, shares at Dec. 31, 2017     9,481,992