Prepaid Expenses and Other Current Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Prepaid Expenses and Other Current Asset
Deposits	$ 225
Insurance	58	$ 403
Sponsored research		97
Other current assets	12	24
Total prepaid expenses and other current assets	$ 295	$ 524

Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Name:	us-gaap_PrepaidInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant