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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2016 $ 10,719 $ 117,293,158 $ (104,368,426) $ 12,935,451
Balance, shares at Dec. 31, 2016 10,718,553      
Cumulative adjustment upon modified retrospective adoption of ASU 2016-09 at Dec. 31, 2017 33,894 (33,894)
Balance after adoption of recent accounting pronouncement at Dec. 31, 2016 10,719 117,327,052 (104,402,320) 12,935,451
Balance after adoption of recent accounting pronouncement, shares at Dec. 31, 2016 10,718,553      
Stock-based compensation expense (employees and directors) 435,679 435,679
Issuance of common stock, net of costs $ 4,169 8,508,692 8,512,861
Issuance of common stock, net of costs, shares 4,168,750      
Exercise of stock options $ 10 10,090 10,100
Exercise of stock options, shares 10,000      
Exercise of warrants $ 63 139,637 139,700
Exercise of warrants, shares 63,500      
Vesting of restricted stock $ 50 (50)
Vesting of restricted stock, shares 50,207      
Shares forfeited in exchange for payment of withholding taxes $ (2) (4,231) (4,233)
Shares forfeited in exchange for payment of withholding taxes, shares (1,764)      
Net loss (6,020,505) (6,020,505)
Balance at Dec. 31, 2017 $ 15,009 126,416,869 (110,422,825) 16,009,053
Balance, shares at Dec. 31, 2017 15,009,246      
Stock-based compensation expense (employees and directors) 186,707 186,707
Exercise of stock options $ 594 686,927 687,521
Exercise of stock options, shares 593,838      
Vesting of restricted stock $ 36 (36)
Vesting of restricted stock, shares 35,681      
Net loss (3,963,576) (3,963,576)
Balance at Dec. 31, 2018 $ 15,639 $ 127,290,467 $ (114,386,401) $ 12,919,705
Balance, shares at Dec. 31, 2018 15,638,765