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Income Taxes - Schedule of Changes in the Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	$ 137,444	$ 109,701
Increases recorded to tax provision	26,138	27,743
Decreases recorded as a benefit to income tax provision	(1,388)	0
Ending balance	$ 162,194	$ 137,444

X

- Definition

Deferred Tax Assets, Valuation Allowance, Decrease In Income Tax Provision, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	indi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred Tax Assets, Valuation Allowance, Increase To Tax Provision, Amount

+ References

No definition available.

+ Details

Name:	indi_DeferredTaxAssetsValuationAllowanceIncreaseToTaxProvisionAmount
Namespace Prefix:	indi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Assets, Valuation Allowance

+ References

No definition available.

+ Details

Name:	indi_DeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix:	indi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant