Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Details)

v2.4.0.8
Significant accounting policies (Details) (USD $)
9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Accounts receivable [Member]
Customer concentration [Member]
item
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
item
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
Customer One [Member]
Dec. 31, 2013
Accounts receivable [Member]
Customer concentration [Member]
Customer Two [Member]
Sep. 30, 2014
Net sales [Member]
Customer One [Member]
Sep. 30, 2013
Net sales [Member]
Customer One [Member]
Sep. 30, 2013
Net sales [Member]
Customer One [Member]
Sep. 30, 2013
Net sales [Member]
Customer Two [Member]
Sep. 30, 2013
Net sales [Member]
Customer Two [Member]
Sep. 30, 2013
Net sales [Member]
Customer Three [Member]
Sep. 30, 2013
Net sales [Member]
Customer Three [Member]
Sep. 30, 2014
Net sales [Member]
Customer concentration [Member]
item
Sep. 30, 2014
Net sales [Member]
Customer concentration [Member]
Customer One [Member]
Sep. 30, 2014
Net sales [Member]
Customer concentration [Member]
Customer Two [Member]
Cash, cash equivalents and short-term investments:                                
Cash and cash equivalent investment portfolio, percentage 12.00%                              
Management fees $ 22,000 $ 13,000                            
Accounts receivable:                                
Accounts receivable, net 12,000                              
Allowance for uncollectable accounts $ 2,000                              
Concentration Risk [Line Items]                                
Risk percentage         38.00% 62.00% 100.00% 43.00% 43.00% 22.00% 22.00% 35.00% 35.00%   78.00% 22.00%
Number of customers     1 2                   2    
Income (loss) per share:                                
Shares not included in the computation of EPS 5,321,000 5,843,000