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Prepaid Expenses and Other Current Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Prepaid Expenses And Other Current Assets [Abstract] |
Schedule of prepaid expenses and other current assets |
|  | September 30, |  |  | December 31, |
(in thousands) |  | 2021 |  |  | 2020 |
Australia research and development credit receivable |  | $ | 1,212 |  |  | $ | 2,148 |
CRO prepayments |  |  | 693 |  |  |  | 1,211 |
Metals to be used in research and development |  |  | 1,691 |  |  |  | 31 |
Directors & Officers Insurance |  |  | 934 |  |  |  | - |
Other |  |  | 202 |  |  |  | 112 |
|  | $ | 4,732 |  |  | $ | 3,502 |

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