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Stock-based compensation (Details)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price $ 0.17
Weighted-Average Remaining Contractual Life (Years) 2 years 7 months 17 days
Number Outstanding | shares 175,000
Weighted-Average Exercise Price, Outstanding $ 0.17
Number Exercisable | shares 175,000
Weighted-Average Exercise Price, Exercisable $ 0.17