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Note payable (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Total note payable | $ 686,000 | $ 490,000
Note payable to related party | 686,000 | 490,000
Note payable, excluding current portion | 0 | 0
Working Capital Loan 1 [Member] |  |
Debt Instrument [Line Items] |  |
Total note payable | 0 | 490,000
Working capital loan 2 [Member] |  |
Debt Instrument [Line Items] |  |
Total note payable | $ 686,000 | $ 0

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