Income taxes - Schedule of Operating Loss Carryovers (Details)	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Total loss carryovers	$ 2,575,000
Year Expiring - 2026 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	1,551,000
Year Expiring - 2027 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	364,000
Year Expiring - 2028 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	248,000
Year Expiring - 2029 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	81,000
Year Expiring - 2030 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	52,000
Year Expiring - 2031 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	39,000
Year Expiring - 2032 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	61,000
Year Expiring - 2033 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	54,000
Year Expiring - 2034 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	57,000
Year Expiring - 2035 [Member]
Operating Loss Carryforwards [Line Items]
Total loss carryovers	$ 68,000