XML 49 R29.htm IDEA: XBRL DOCUMENT v3.25.4

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Significant Accounting Policies

Schedule of accounts receivables

​

​	​	​	​	​	​	​
​	​ ​ ​	December 31,
​	​	2025		​ ​ ​	2024
Accounts receivable not billed	​	​	2,068	​	​	438

Schedule of credit risk and major customers

​

​	​	​	​	​	​
​	​	For the Years Ended December 31,			​
​	​ ​ ​	2025	​ ​ ​	2024	​ ​ ​
Revenue concentration	​	​	​	​	​
Number of customers	​	3		3
Related total revenue percentage		95	%	98	%
Accounts receivable concentration		​		​
Number of customers		2		2
Related contract receivable and contract asset percentage		98	%	94	%
Contract asset concentration	​	​	​	​	​
Number of customers	​	1	​	—	​
Related contract receivable and contract asset percentage	​	100	%	—	%

Summary of estimated useful life of property, plant and equipment

​

​	​	​
​	​ ​ ​	Depreciable Life
Production equipment	​	5 years
Laboratory equipment	​	5 years
Furniture and computer equipment		3-7 years
Leasehold improvements		Lesser of asset life or lease term

Schedule of revenue and grant income

​

​	​	​	​	​	​
​	Year Ended December 31,
​	2025		​ ​ ​	2024
Government - revenue	$	2,124	​	$	2,732
Government - grant income	​	3,834	​	​	—
Non-government revenue	​	15,789	​	​	17,407
Total revenue and grant income	$	21,747	​	$	20,139

Schedule of deferred revenue

​

​	​	​	​	​	​	​
​	​ ​ ​	December 31,
​	​	2025		​ ​ ​	2024
Deferred revenue	​	$	198	​	$	3,150
Deferred revenue from related parties	​	​	172	​	​	—

X

- Definition

The tabular disclosure of estimated useful life of property, plant and equipment.

+ References

No definition available.

+ Details

Name:	sldp_PropertyPlantAndEquipmentEstimatedUsefulLifeTableTextBlock
Namespace Prefix:	sldp_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The tabular disclosure of contract receivables.

+ References

No definition available.

+ Details

Name:	sldp_ScheduleOfContractReceivablesTableTextBlock
Namespace Prefix:	sldp_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

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

Tabular disclosure of the type of arrangements and the corresponding amounts that comprise the current and noncurrent balance of deferred revenue as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredRevenueByArrangementDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

+ Details

Name:	us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

+ Details

Name:	us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration