Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Details)

v3.3.0.814
Significant accounting policies (Details)
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
shares
Sep. 30, 2015
USD ($)
item
shares
Sep. 30, 2014
USD ($)
item
shares
Cash, cash equivalents and short-term investments:        
Cash and cash equivalent investment portfolio, percentage 10.00%   10.00%  
Management fees | $     $ 23,000 $ 22,000
Accounts receivable:        
Accounts receivable, net | $ $ 58,000   58,000  
Allowance for uncollectable accounts | $ $ 1,600   $ 1,600  
Income (loss) per share:        
Shares not included in the computation of EPS | shares 6.2 5.3 6.2 5.3
Accounts receivable [Member] | Customer concentration [Member]        
Concentration Risk [Line Items]        
Number of customers     3  
Accounts receivable [Member] | Customer concentration [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Risk percentage     39.00%  
Accounts receivable [Member] | Customer concentration [Member] | Customer Two [Member]        
Concentration Risk [Line Items]        
Risk percentage     37.00%  
Accounts receivable [Member] | Customer concentration [Member] | Customer Three [Member]        
Concentration Risk [Line Items]        
Risk percentage     24.00%  
Net sales [Member] | Customer concentration [Member]        
Concentration Risk [Line Items]        
Number of customers       2
Net sales [Member] | Customer concentration [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Risk percentage       78.00%
Net sales [Member] | Customer concentration [Member] | Customer Two [Member]        
Concentration Risk [Line Items]        
Risk percentage       22.00%
Net sales [Member] | European-based concentration [Member]        
Concentration Risk [Line Items]        
Number of customers     3  
Net sales [Member] | European-based concentration [Member] | Customer One [Member]        
Concentration Risk [Line Items]        
Risk percentage     48.00%  
Net sales [Member] | European-based concentration [Member] | Customer Two [Member]        
Concentration Risk [Line Items]        
Risk percentage     29.00%  
Net sales [Member] | European-based concentration [Member] | Customer Three [Member]        
Concentration Risk [Line Items]        
Risk percentage     23.00%