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Revenues
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenues
 
5.
Revenues
The following tables present the Company’s net revenues disaggregated by geography based on the location of the customer, by product line (in thousands):
 
 
  
Three Months Ended March 31, 2023
 
 
  
Brick Products
 
  
Advanced Products
 
  
Total
 
United States
    $ 21,256      $ 13,710      $ 34,966  
Europe
      7,546        4,027        11,573  
Asia Pacific
      16,847        33,444        50,291  
All other
      876        110        986  
    
 
 
     
 
 
     
 
 
  
     $ 46,525      $ 51,291      $ 97,816  
    
 
 
     
 
 
     
 
 
  
   
     Three Months Ended March 31, 2022  
     Brick Products      Advanced Products      Total  
United States
    $ 14,061      $ 10,626      $ 24,687  
Europe
      7,042        2,768        9,810  
Asia Pacific
      13,521        39,495        53,016  
All other
      733        36        769  
    
 
 
     
 
 
     
 
 
  
     $ 35,357      $ 52,925      $ 88,282  
    
 
 
     
 
 
     
 
 
  
 
 
The following tables present the Company’s net revenues disaggregated by the category of revenue, by product line (in thousands):
 
 
  
Three Months Ended March 31, 2023
 
 
  
Brick Products
 
  
Advanced Products
 
  
Total
 
Direct customers, contract manufacturers and
non-stocking
distributors
    $ 30,486      $ 42,013      $ 72,499  
Stocking distributors, net of sales allowances
      15,737        5,052        20,789  
Non-recurring
engineering
      302        2,128        2,430  
Royalties
      —          2,020        2,020  
Other
      —          78        78  
    
 
 
     
 
 
     
 
 
  
     $ 46,525      $ 51,291      $ 97,816  
    
 
 
     
 
 
     
 
 
  
   
     Three Months Ended March 31, 2022  
     Brick Products      Advanced Products      Total  
Direct customers, contract manufacturers and
non-stocking
distributors
    $ 24,401      $ 47,471      $ 71,872  
Stocking distributors, net of sales allowances
      10,764        3,744        14,508  
Non-recurring
engineering
      192        1,386        1,578  
Royalties
      —          306        306  
Other
      —          18        18  
    
 
 
     
 
 
     
 
 
  
     $ 35,357      $ 52,925      $ 88,282  
    
 
 
     
 
 
     
 
 
  
The following table presents the changes in certain contract assets and (liabilities) (in thousands):
 
 
  
March 31, 2023
 
  
December 31, 2022
 
  
Change
 
Short-term deferred revenue and customer prepayments
    $ (9,765 )     $ (13,197 )     $ 3,432  
Long-term deferred revenue
      (2,183 )       (145 )       (2,038 ) 
Deferred expenses
      98        577        (479 ) 
Sales allowances
      (2,389 )       (1,661 )       (728 ) 
Deferred expenses are included in Other current assets in the accompanying Condensed Consolidated Balance Sheets.

The Company records deferred revenue, which represents a contract liability, when cash payments are received or due in advance of performance under a contract with a customer. The Company recognized revenue of approximately $
1,609,000
and $
155,000
for the three months ended March 31, 2023 and 2022, respectively, that was included in deferred revenue at the beginning of the respective period.