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Subsequent Events (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2025	Aug. 12, 2025
Forecast [Member] | Minimum [Member]
Subsequent Event [Line Items]
Severance and other employee termination-related costs	$ 0.9
Forecast [Member] | Maximum [Member]
Subsequent Event [Line Items]
Severance and other employee termination-related costs	$ 1.2
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage Of Reduction In Total Workforce		12.00%

X

- Definition

Percentage of reduction in total workforce.

+ References

No definition available.

+ Details

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Namespace Prefix:	fate_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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