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Income taxes (Details 2) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
U.S. statutory federal rate | 34.00% | 34.00%
State taxes, net of federal effect | 2.00% | (2.00%)
Foreign tax rate differential | (82.91%) | (128.30%)
R&D tax credit | (2.49%) | 0.00%
Permanent items | 13.39% | 20.90%
Tax Act adjustment | (11.25%) | 0.00%
Valuation allowance for deferred tax assets | 28.90% | 51.40%
Effective Income Tax Rate Reconciliation, Percent | (18.36%) | (24.00%)

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