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Basis of presentation, summary of significant accounting policies (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jan. 28, 2019 | Dec. 31, 2018
Conversion of notes into shares | 1,813,500 |  |  |
Fair value of notes | $ 10,225,959 | $ 10,225,959 |  |
Expected operating liabilities to be recorded from adoption of FASB ASU 2016-02 |  |  |  | $ 1,500,000
Senior Secured Promissory Notes [Member] |  |  |  |
Warrant issued |  |  | 1,908,144 |
Senior Secured Convertible Promissory Notes [Member] |  |  |  |
Conversion of notes into shares | 1,813,500 |  |  |
Fair value of notes | $ 10,200,000 | 3,900,000 |  |
Senior Secured Convertible Promissory Notes [Member] | Investors [Member] |  |  |  |
Debt instrument face amount | $ 3,358,333 | $ 3,358,333 | $ 3,358,333 |
Warrant issued |  |  | 1,908,144 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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