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REVENUES
 3 Months Ended
Mar. 31, 2024
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, 
   2024   2023 
Product sales  $13,570   $12,811 
Maintenance fees   27    16 
Professional services   65    36 
Shipping and handling   978    216 
Discounts and allowances   (80)   (59)
Total revenues  $14,561   $13,020 

 

During the three months ended March 31, 2024 and 2023, 27% and 60% of revenues were derived from customers located in California, respectively. In addition, 11% and 10% of revenues in the three months ended March 31, 2024 and 2023 were international sales, respectively.

 

At March 31, 2024 and December 31, 2023, deferred revenue was $1.5 million and $1.2 million, respectively. These amounts consisted mainly of customer deposits in the amount of $0.9 million and $0.7 million for March 31, 2024 and December 31, 2023, respectively and prepaid multi-year maintenance plans for previously sold products which account for $0.6 million and $0.5 million for March 31, 2024 and December 31, 2023, respectively, and pertain to services to be provided through 2031.