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Significant Accounting Policies - Deferred revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Significant Accounting Policies
Deferred revenue	$ 198	$ 3,150
Deferred revenue from related parties	$ 172

X

- Definition

Amount of deferred income and obligation to transfer product and service from related party for which consideration has been received or receivable.

+ References

No definition available.

+ Details

Name:	sldp_DeferredRevenueFromRelatedParties
Namespace Prefix:	sldp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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