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Stock Option Plans and Warrants to Purchase Common Stock (Tables)
 12 Months Ended
Dec. 31, 2014
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option and warrant activity

  Options  

Weighted Average

Options Exercise Price

 
Balance at December 31, 2012  1,457,724  $3.19 
  Granted  791,100   1.35 
  Exercised  (103,439)  0.57 
  Forfeited  (93,874)  2.84 
Balance at December 31, 2013  2,051,511  $2.63 
  Granted  637,495   1.79 
  Exercised  (36,672)  0.77 
  Forfeited  (164,055)  3.13 
Balance at December 31, 2014  2,488,279  $2.40 
 
Weighted-average range of exercise prices for options and warrants outstanding and exercisable

Price Range

 Weighted Average Remaining
Contractual Life in Years		 Outstanding 
Options		  Exercisable 
Options		 
$0.30-$2.20 7.7  1,805,755   1,193,081 
$2.26-$4.10 6.9  174,774   174,778 
$4.64-$9.40 3.7  507,750   507,750 
Total 6.9  2,488,279   1,875,609 
 
Warrant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option and warrant activity

  Warrants  

Weighted Average

Warrant Exercise Price

 
Balance at December 31, 2012  2,843,338  $3.13 
  Granted  5,421,581   1.65 
  Exercised  (107,143)  1.65 
  Expired/Cancelled  (1,250)  15.00 
Balance at December 31, 2013  8,156,526  $2.17 
  Granted  1,169,318   1.48 
  Exercised  (586,081)  1.65 
  Expired/Cancelled  (1,470,263)  3.49 
Balance at December 31, 2014  7,269,500  $1.15 
 
Weighted-average range of exercise prices for options and warrants outstanding and exercisable

Price Range

 Weighted Average Remaining
Contractual Life in Years		 Outstanding 
Warrants		  Exercisable Warrants 
$.53-$2.05 3.7  6,672,548   6,672,548 
$5.12-$6.06 0.5  596,952   596,952 
Total 3.4  7,269,500   7,269,500 
 
Equity Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of option and warrant activity

  December 31, 
  2014  2013 
Shares available for grant at beginning of year  672,485   129,711 
  Increase in shares available for the plan  -   1,250,000 
  Options granted  (637,495)  (791,100)
  Options forfeited or expired  149,055   83,874 
         
Shares available for grant at end of year  184,045   672,485