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REVENUES
 6 Months Ended
Jun. 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   Six Months Ended 
   June 30,   June 30, 
   2023   2022   2023   2022 
Product sales  $17,103   $3,192   $29,914   $6,754 
Maintenance fees   18    9    34    20 
Professional services   24    405    60    431 
Shipping and handling   804    114    1,020    296 
Discounts and allowances   (130)   (2)   (189)   (13)
Total revenues  $17,819   $3,718   $30,839   $7,488 

 

During the six months ended June 30, 2023 and 2022, 13% and 43% of revenues were derived from customers located in California, respectively. In addition, 10.3% and 10.4% of revenues in the six months ended June 30, 2023 and 2022 were international sales, respectively.

 

At June 30, 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 $1.1 million for June 30, 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 June 30, 2023 and December 31, 2022, respectively, and pertain to services to be provided through 2029.