Leases (Schedule of maturities of lease liabilities) (Details) $ in Thousands |
Dec. 31, 2019
USD ($)
|
|---|---|
| Maturities of lease liabilities - Year ending December 31 | |
| 2020 | $ 7 |
| 2021 | 7 |
| 2022 | 7 |
| 2023 | 6 |
| Total lease payments | 27 |
| Less imputed interest | (3) |
| Total | $ 24 |