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REVENUE
 6 Months Ended
Jun. 30, 2026
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Disaggregated Revenue
The following table presents the Company’s revenue, disaggregated by source (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
Product revenue$69 $2,337 $58 $2,744 
Service revenue4 32 15 60 
Other revenue— (11)128 153 
Total revenue$73 $2,358 $201 $2,957 
The majority of the Company’s revenue is derived from product sales of energy storage systems, extended warranty services, and other revenue which includes engineering services related to product site deployment and customer reimbursements for freight, travel, and other out-of-pocket expenses.
Contract Balances
Contract assets relate to unbilled amounts resulting from contract arrangements in which the related revenue recognition performance obligations have been satisfied, however invoicing to the customer has not yet occurred. Deferred revenue (or contract liabilities) relates to consideration received from customers in advance of the Company satisfying the revenue recognition performance obligations under the related contractual arrangements. Contract balances are reported in a net contract asset or deferred revenue liability position on a contract-by-contract basis at the end of each reporting period. Contract assets are included in prepaid expenses and other current assets and deferred revenue is presented separately on the condensed consolidated balance sheets.
The following table provides information about contract assets and deferred revenue from contracts with customers (in thousands):
June 30, 2026December 31, 2025
Contract assets$610 $614 
Deferred revenue5,577 5,656 
Contract assets decreased by $4 thousand during the six months ended June 30, 2026. Deferred revenue decreased by $79 thousand during the six months ended June 30, 2026 reflecting the recognition of revenue that was included in the deferred revenue balance at the beginning of the period and customer billings.
Deferred revenue of $0.3 million is expected to be recognized within the next 12 months and non-current deferred revenue of $5.3 million is expected to be recognized thereafter as firm orders are received and fulfilled. Additionally, contracted but unsatisfied performance obligations that had not yet been billed to the customer or included in deferred revenue were $1.0 million as of June 30, 2026, for which timing of recognition is uncertain.