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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock-based compensation expense
  Three months ended  
March 31,		 
  2016  2015 
Research and development $43  $223 
Sales and marketing  62   106 
General and administrative  9   269 
Total stock-based compensation expense $114  $598 

 

  Remaining unrecognized 
expense at 
March 31, 2016		 
Stock-based compensation $385 

 
Summary of all warrant activity
  March 31, 2016 
 Warrants  Weighted Average Exercise Price  Weighted Average 
Remaining Contractual Life		 
Outstanding and exercisable, January 1, 2016  464,073  $3.02   0.19 
   Granted  --   --   -- 
   Expired/cancelled  (349,973)  3.13   -- 
   Exercised  (80,000)  2.00   -- 
Outstanding and exercisable, March 31, 2016  34,100  $3.13   0.02 
 
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, 2016  2,184,117  $4.48 
Granted  -   - 
Forfeited  (111,922)  4.47 
Outstanding at March 31, 2016  2,072,195  $4.48
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
           
March 2011 Investor Warrants 4/7/2011 $3.13   34,100  4/7/2016
Total Warrants Outstanding        34,100