v3.21.2

Warrant derivative liability (Investor Warrants) (Details) - USD ($) $ / shares in Units, $ in Thousands | Jun. 18, 2020 | Apr. 05, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 15, 2017 | Nov. 13, 2017
--- | --- | --- | --- | --- | --- | ---
Class of Warrant or Right, Outstanding |  |  |  |  | 896,739 |
Private Placement [Member] | Investor [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 1.00 | $ 0.80
Class of Warrant or Right, Outstanding |  |  | 422,922 | 721,836 |  |
Warrants Not Settleable in Cash, Fair Value Disclosure |  |  | $ 203 | $ 223 |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 4,500,000 | 434,783 |  |  |  |
Warrant Purchase on Issue of Ordinary Shares |  | 326,087 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 2.75 |  |  |  |
Securities Purchase Agreement, Warrants Issued percentage |  | 75.00% |  |  |  |

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