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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Balances at Dec. 31, 2013 $ 44,823,747 $ 1,267 $ 0 $ 92,686,881 $ 0 $ (47,864,401)
Balances in (shares) at Dec. 31, 2013   12,668,393        
Net loss (20,372,676) $ 0 0 0 0 (20,372,676)
Unrealized net loss on marketable investment securities 0          
Stock-based compensation 1,892,835 0 0 1,892,835 0 0
Option exercises 56,776 $ 2 0 56,774 0 0
Option exercises in (shares)   20,205        
Vesting of restricted stock awards 0 $ 10 0 (10) 0 0
Vesting of restricted stock awards in (shares)   96,784        
Vesting or restricted stock units 0 $ 1 0 (1) 0 0
Vesting or restricted stock units in (shares)   15,000        
Purchase of treasury stock (40,712) $ 0 $ (40,712) 0 0 0
Purchase of treasury stock in (shares)   (5,710) 5,710      
Balances at Dec. 31, 2014 26,359,970 $ 1,280 $ (40,712) 94,636,479 0 (68,237,077)
Balances in (shares) at Dec. 31, 2014   12,794,672 5,710      
Net loss (18,208,378) $ 0 $ 0 0 0 (18,208,378)
Unrealized net loss on marketable investment securities (32,900) 0 0 0 (32,900) 0
Stock-based compensation 1,150,418 0 0 1,150,418 0 0
Option exercises 276,994 $ 10 0 276,984 0 0
Option exercises in (shares)   98,574        
Vesting of restricted stock awards 0 $ 0 0 0 0 0
Vesting of restricted stock awards in (shares)   4,000        
Issuance of common stock in offering 32,439,313 $ 535 0 32,438,778 0 0
Issuance of common stock in offering in (shares)   5,347,500        
Balances at Dec. 31, 2015 41,985,417 $ 1,825 $ (40,712) 128,502,659 (32,900) (86,445,455)
Balances in (shares) at Dec. 31, 2015   18,244,746 5,710      
Net loss (18,971,508) $ 0 $ 0 0 0 (18,971,508)
Unrealized net loss on marketable investment securities 24,407 0 0 0 24,407 0
Stock-based compensation 2,372,615 0 0 2,372,615 0 0
Option exercises 605,870 $ 21 0 605,849 0 0
Option exercises in (shares)   208,869        
Vesting of restricted stock awards 0 $ 0 0 0 0 0
Vesting of restricted stock awards in (shares)   3,000        
Balances at Dec. 31, 2016 $ 26,016,801 $ 1,846 $ (40,712) $ 131,481,123 $ (8,493) $ (105,416,963)
Balances in (shares) at Dec. 31, 2016   18,456,615 5,710