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Financial instruments (Details 1)
 12 Months Ended
Dec. 31, 2017
USD ($)
Financial Instruments [Line Items]  
Beginning $ (680,000) [1]
Unrealized gain 960,000
Ending $ 280,000 [2]
[1] The net (liability) arising from the put/call options is included in other liabilities in the accompanying consolidated balance sheets as of December 31, 2016.
[2] The net asset arising from the put/call options is included in other assets in the accompanying consolidated balance sheets as of December 31, 2017.