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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock-based compensation expense

    Three months ended  
March 31,		  
    2015     2014  
Product research and development   $ 223     $ 268  
Sales and marketing     106       175  
General and administrative     269       629  
Total stock-based compensation expense   $ 598     $ 1,072  

 

    Remaining unrecognized 
expense at 
March 31, 2015		  
Stock-based compensation   $ 1,180  

 
Summary of assumptions used to value stock options granted to employees and directors

   For the three months
   ended March 31, 2015
   
Annual dividend yield  -
Expected life (years)  1.50 - 4.24
Risk-free interest rate  0.47% - 1.41%
Expected volatility  70% - 72%

 
Summary of all warrant activity

    March 31, 2015  
Outstanding and exercisable   Warrants     Weighted Average Exercise Price     Weighted Average 
Remaining Contractual Life		  
January 1, 2015     3,335,073     $ 4.45       0.93  
Granted     --       --       --  
Expired/cancelled     --       --       --  
Exercised     --       --       --  
Outstanding and exercisable, March 31, 2015     3,335,073     $ 4.45       0.69  

 
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of all stock option plans / warrant activity

  Number of Options Outstanding  Weighted Average Exercise Price 
Outstanding at January 1, 2015  1,709,400  $4.92 
Granted  575,000   3.55 
Expired/forfeited  (3,200)  86.25 
Outstanding at March 31, 2015  2,281,200  $4.46 

 
Warrant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of all stock option plans / warrant activity
Description Issue  Date Exercise
Price		  Shares  Expiration
Date
           
August 2009 Employee Warrants 8/25/2009 $0.50   80,000  8/25/2016
2007 Debt Extension Warrants 9/22/2010 $1.00   16,000  9/22/2015
December 2010 Employee Warrants 12/3/2010 $1.63   200,000  12/3/2015
February 2011 Legal Advisor Warrant 2/22/2011 $2.50   80,000  2/22/2016
March  2011 Investor Warrants 3/9/2011 $3.13   349,973  3/9/2016
March  2011 Investor Warrants 4/7/2011 $3.13   34,100  4/7/2016
May 2014 Agent Warrant 5/15/2014 $5.09   75,000  11/15/2015
May 2014 Investor Warrant 5/15/2014 $5.09   2,500,000  11/15/2015
Total Warrants Outstanding        3,335,073