Nature of business and summary of significant accounting policies, Commitments and contingencies (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Taxes Payable [Abstract] | ||
| Sales and Excise Tax Payable | $ 1.2 | $ 0.0 |
| Previously Reported [Member] | ||
| Taxes Payable [Abstract] | ||
| Sales and Excise Tax Payable | $ 0.7 |
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Details
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