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REVENUES
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
REVENUES

 

12. REVENUES

 

For each of the identified periods, revenues can be categorized into the following (in thousands): 

          
   Three Months Ended 
   March 31, 
   2023   2022 
Product sales  $12,811   $3,562 
Maintenance fees   16    11 
Professional services   36    26 
Shipping and handling   216    181 
Discounts and allowances   (59)   (10)
Total revenues  $13,020   $3,770 

 

During the three months ended March 31, 2023 and 2022, 60% and 48% of revenues were derived from customers located in California, respectively. In addition, 10% and 4% of revenues in the three months ended March 31, 2023 and 2022 were international sales, respectively.

 

At March 31, 2023 and December 31, 2022, deferred revenue was $1.1 million and $1.4 million, respectively. These amounts consisted mainly of customer deposits in the amount of $0.7 million and $1.0 million for March 31, 2023 and December 31, 2022, respectively and prepaid multi-year maintenance plans for previously sold products which account for $0.4 million and $0.3 million for March 31, 2023 and December 31, 2022, respectively, and pertain to services to be provided through 2029.