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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - USD ($) $ in Thousands | Sep. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Nov. 30, 2019
--- | --- | --- | --- | --- | --- | ---
Restricted cash | $ 1,512 | $ 1,512 |  | $ 1,512 | $ 5,835 |
The 2.75% Convertible Notes [Member] |  |  |  |  |  |
Interest rate | 2.75% |  | 2.75% | 2.75% |  | 2.75%
Convertible Debt [Member] | The 2.75% Convertible Notes [Member] |  |  |  |  |  |
Interest rate | 2.75% |  |  | 2.75% |  |

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