XML 28 R5.htm IDEA: XBRL DOCUMENT v3.22.1

Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Research and development expense, related party	$ 935	$ 579

X

- Definition

Research and development expense related party.

+ References

No definition available.

+ Details

Name:	fdmt_ResearchAndDevelopmentExpenseRelatedParty
Namespace Prefix:	fdmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration