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Unaudited Condensed Statement of Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($)
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance at Dec. 31, 2017 $ 46,224,979 $ 961 $ 89,907,766 $ (1,257,100) $ (16,907) $ (42,409,741)
Beginning balance, shares at Dec. 31, 2017   9,481,992        
Stock-based compensation 2,127,858   2,127,858      
Exercise of stock options $ 299,955 $ 14 299,941      
Exercise of stock options, shares 136,094 136,094        
Common stock repurchases $ (1,323,173)     (1,323,173)    
Common stock repurchases, shares   (150,528)        
Unrealized gain on available-for-sale securities, net of tax 6,987       6,987  
Net loss (4,296,138)         (4,296,138)
Ending balance at Jun. 30, 2018 $ 43,040,468 $ 975 $ 92,335,565 $ (2,580,273) $ (9,920) $ (46,705,879)
Ending balance, shares at Jun. 30, 2018   9,467,558