Fair Value Measurements - Public Warrants measured at fair value using Level 1 directly observable inputs and Private Placement Warrants (Details) - Recurring	12 Months Ended
Dec. 31, 2024 $ / shares
Public Warrants \| Level 1
Reconciliation
Beginning balance, per share	$ 0.19
Change in fair value	0.23
Ending balance, per share	0.42
Private Placement Warrants \| Level 2
Reconciliation
Beginning balance, per share	0.28
Change in fair value	0.24
Ending balance, per share	$ 0.52

Per share fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

No definition available.

Name:	sldp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityValuePerShare
Namespace Prefix:	sldp_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant