Prepaid Expenses	12 Months Ended
Dec. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid Expenses	6. Prepaid Expenses As of December 31, 2021, the amount of prepaid expenses was $2,519, consisting of $1,481 of prepaid R&D clinical costs, $369 of prepaid insurance and $669 of other costs. As of December 31, 2020, the amount of prepaid expenses was $12,076, consisting of $11,286 of prepaid R&D clinical costs, $223 of prepaid insurance and $567 of other costs.

Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_DeferredCostsCapitalizedPrepaidAndOtherAssetsDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration