Accrued Liabilities (Details) - Schedule of accrued liabilities - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of accrued liabilities [Abstract]
Accrued professional fees	$ 189	$ 1,826
Accrued compensation and benefits	1,225	817
Accrued CRO fees	788	95
Deferred grant funds	301	80
Accrued expense reimbursements	33	36
Accrued transaction costs	1,354
Other	70	24
Accrued liabilities	$ 3,960	$ 2,878