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REVENUE
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
Disaggregated Revenue
The following table presents the Company’s revenue, disaggregated by source (in thousands):
Year Ended December 31,
20222021
Product revenue$803 $— 
Service and other revenue91 — 
Total revenue$894 $— 
The majority of the Company’s revenue is derived from the product sales of energy storage systems. See Note 2, Significant Accounting Policies for further information regarding revenue recognition.
Contract Balances
Deferred revenues primarily relate to consideration received from customers in advance of the Company satisfying performance obligations under 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.
The following table summarizes deferred revenue activity (in thousands):
Year Ended December 31,
20222021
Deferred revenue - beginning of period$3,663 2,258 
Deferral of revenue7,704 1,405 
Recognition of previously unearned revenue(830)— 
Deposits returned to customers(1,157)— 
Reclassification to accrued liabilities due to estimation of variable consideration(770)— 
Deferred revenue - ending of period$8,610 $3,663