Basis of presentation, summary of significant accounting policies (Narrative) (Details) - USD ($) |
Mar. 31, 2019 |
Jan. 28, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| 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] | Investors [Member] | |||
| Debt instrument face amount | $ 3,358,333 | $ 3,358,333 | |
| Warrant issued | 1,908,144 |
| X | ||||||||||
- Definition Expected operating liabilities to be recorded from adoption of FASB ASU 2016-02. No definition available.
|
| X | ||||||||||
- 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|