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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three months ended

   

Six months ended

 
   

June 30,

   

June 30,

 
   

2014

   

2013

   

2014

   

2013

 

Basic and diluted loss per share:

                               

Net loss

  $ (622 )   $ (679 )   $ (4,692 )   $ (2,107 )
                                 

Basic and diluted loss per share:

                               

Weighted average shares outstanding

    7,836       4,623       6,512       4,547  
                                 

Basic and diluted net loss per share

  $ (0.08 )   $ (0.15 )   $ (0.72 )   $ (0.46 )
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Three months ended

   

Six months ended

 
   

June 30,

   

June 30,

 
   

2014

   

2013

   

2014

   

2013

 
                                 

Cost of sales

  $ 4     $ 1     $ 6     $ 1  

Research and development

    3       8       2       15  

Selling, general, and administrative

    128       42       250       80  

Total stock-based compensation

  $ 135     $ 51     $ 258     $ 96  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Six months ended

 
   

June 30,

 
   

2014

   

2013

 
                 

Fair value of options issued

  $ 3.34     $ 1.58  

Exercise price

  $ 4.34     $ 2.32  

Expected life of option

    5.6       7.4  

Risk-free interest rate

    1.79 %     1.30 %

Expected volatility

    98.1 %     89.2 %

Dividend yield

    0 %     0 %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Options

   

Weighted

Average

Exercise Price

   

Weighted

Average

Remaining Contractual

Term (in

Years)

 

Outstanding as of December 31, 2013

    286,188     $ 15.30          

Granted

    208,000       4.34          

Exercised

    (500 )     2.30          

Cancelled/forfeited

    (83,561 )     15.61          

Outstanding as of June 30, 2014

    410,127     $ 9.70       7.6  
                         

Vested and expected to vest as of June 30, 2014

    372,885     $ 8.59       8.4  
                         

Exercisable as of June 30, 2014

    207,818     $ 14.83       7.2  
Schedule of Product Warranty Liability [Table Text Block]
   

Three months ended

   

Six months ended

 
   

June 30,

   

June 30,

 
   

2014

   

2013

   

2014

   

2013

 
                                 

Balance at the beginning of the period

  $ 75     $ 140     $ 75     $ 159  

Accruals for warranties issued

    -       23       16       39  

Settlements made during the period (in cash or in kind)

    (7 )     (13 )     (23 )     (48 )

Balance at the end of the period

  $ 68     $ 150     $ 68     $ 150