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REVENUES
 9 Months Ended
Sep. 30, 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   Nine Months Ended 
   September 30,   September 30, 
   2023   2022   2023   2022 
Product sales  $15,781   $6,268   $45,696   $13,022 
Maintenance fees   23    17    57    37 
Professional services   35    60    95    491 
Shipping and handling   742    288    1,762    584 
Discounts and allowances   (95)   (22)   (285)   (35)
Total revenues  $16,486   $6,611   $47,325   $14,099 

 

During the nine months ended September 30, 2023 and 2022, 14% and 36% of revenues were derived from customers located in California, respectively. In addition, 10% and 11% of revenues in the nine months ended September 30, 2023 and 2022 were international sales, respectively.

 

At September 30, 2023 and December 31, 2022, deferred revenue was $0.8 million and $1.4 million, respectively. These amounts consisted mainly of customer deposits in the amount of $0.4 million and $1.1 million for September 30, 2023 and December 31, 2022, respectively and prepaid multi-year maintenance plans for previously sold products which account for $0.5 million and $0.3 million for September 30, 2023 and December 31, 2022, respectively, and pertain to services to be provided through 2029.