Government Grants - Additional Information (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:AccruedLiabilitiesAndOtherLiabilities
Government Assistance [Line Items]
Government grant liabilities	$ 1.8
CIRM
Government Assistance [Line Items]
Aggregate CIRM funding amount	$ 25.7
Percentage of holdback payments	5.00%
Initial distribution amount of CIRM	$ 3.8
Non-CIRM
Government Assistance [Line Items]
Aggregate Co-Funding Amount	7.1
STX-1400
Government Assistance [Line Items]
Aggregate CIRM funding amount	13.0
STX-1200
Government Assistance [Line Items]
Aggregate CIRM funding amount	$ 12.7

Aggregate co-funding amount.

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- Definition

Percentage of holdback payments.

+ References

No definition available.

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- Definition

Amount of distribution payable to ownership interest holder from investment income and return of capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(10)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 405
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478790/946-405-45-2

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- Definition

Amount of government assistance awarded that comprises amount received, receivable, and to be received unless condition for government assistance is not met. Includes, but is not limited to, government grant, assistance, incentive, award, subsidy, and loan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

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- Definition

Amount of liability from government assistance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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