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Selected quarterly financial information (Tables)
 12 Months Ended
Dec. 31, 2012
Selected quarterly financial information [Abstract]  
Schedule of Selected Quarterly Financial Information
   
March 31,
    
June 30,
    
September 30,
    
December 31,
  
Fiscal 2012 quarters ended:
                                
Total revenues
  
$
7,000
    
$
27,000
    
$
6,000
    
$
2,000
  
Gross margin
  
$
7,000
    
$
27,000
    
$
6,000
    
$
1,000
  
Net loss
  
$
(1,938,000
)
  
$
(2,310,000
)
  
$
(2,460,000
)
  
$
(2,504,000
)
Loss per share - Basic and diluted
  
$
(1.20
)
  
$
(1.19
)
  
$
(.32
)
  
$
(0.87
)
Market price of common stock
                                
High
  
$
5.88
    
$
4.44
    
$
2.77
    
$
2.93
  
Low
  
$
3.90
    
$
1.88
    
$
1.33
    
$
2.04
  
                                 
Fiscal 2011 quarters ended:
                                
Total revenues
  
$
97,000
    
$
55,000
    
$
22,000
    
$
45,000
  
Gross margin
  
$
85,000
    
$
52,000
    
$
22,000
    
$
44,000
  
Net loss
  
$
(2,806,000
)
  
$
(2,787,000
)
  
$
(3,064,000
)
  
$
(1,557,000
)
Loss per share - Basic and diluted
  
$
(2.10
)
  
$
(2.10
)
  
$
(2.28
)
  
$
(0.96
)
Market price of common stock
                                
High
  
$
25.50
    
$
23.61
    
$
22.50
    
$
17.53
  
Low
  
$
16.80
    
$
18.60
    
$
14.40
    
$
5.82