Fair value of financial instruments (Details 4) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
| 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, March 31, 2019 | $ 0 | |
| X | ||||||||||
- References No definition available.
|
| 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
|
| X | ||||||||||
- Definition It represents that conversion of warrants into common stock distribution. No definition available.
|
| X | ||||||||||
- Definition The amount refers investment in warrant. No definition available.
|
| X | ||||||||||
- Definition The amount of warrants issue during the period No definition available.
|