Fair value of financial instruments (Details 4) - USD ($) |
6 Months Ended | |
|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
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| Debt Disclosure [Abstract] | ||
| Investment in warrants, December 31, 2018 | $ 67,000 | |
| Warrants issued to the Company | 19,000 | |
| Increase in fair value | 55,000 | $ 0 |
| Conversion of warrants into common stock | (141,000) | |
| Investment in warrants, June 30, 2019 | $ 0 | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition It represents that conversion of warrants into common stock distribution. No definition available.
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| X | ||||||||||
- Definition The amount refers investment in warrant. No definition available.
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| X | ||||||||||
- Definition The amount of warrants issue during the period No definition available.
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