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Revenues
 3 Months Ended
Mar. 31, 2021
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, 2021  
     Brick Products      Advanced Products      Total  
United States
    $ 18,583      $ 8,549      $ 27,132  
Europe
      8,196        995        9,191  
Asia Pacific
      27,328        24,653        51,981  
All other
      352        140        492  
    
 
 
     
 
 
     
 
 
  
     $ 54,459      $ 34,337      $ 88,796  
    
 
 
     
 
 
     
 
 
  
   
     Three Months Ended March 31, 2020  
     Brick Products      Advanced Products      Total  
United States
    $ 25,970      $ 7,597      $ 33,567  
Europe
      4,568        879        5,447  
Asia Pacific
      13,656        9,376        23,032  
All other
      1,323        32        1,355  
    
 
 
     
 
 
     
 
 
  
     $ 45,517      $ 17,884      $ 63,401  
    
 
 
     
 
 
     
 
 
  
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, 2021  
     Brick Products      Advanced Products      Total  
Direct customers, contract manufacturers and
non-stocking
distributors
    $ 43,808  
 		    $  29,057  
 		    $  72,865  
 
Stocking distributors, net of sales allowances
      10,547        4,138        14,685  
Non-recurring
engineering
      104        1,071        1,175  
Royalties
      —          53        53  
Other
      —          18        18  
    
 
 
     
 
 
     
 
 
  
     $ 54,459      $ 34,337      $ 88,796  
    
 
 
     
 
 
     
 
 
  
   
     Three Months Ended March 31, 2020  
     Brick Products      Advanced Products      Total  
Direct customers, contract manufacturers and
non-stocking
distributors
    $ 35,739      $ 14,767      $ 50,506  
Stocking distributors, net of sales allowances
      9,622        3,062        12,684  
Non-recurring
engineering
      156        37        193  
Other
      —          18        18  
    
 
 
     
 
 
     
 
 
  
     $ 45,517      $ 17,884      $ 63,401  
    
 
 
     
 
 
     
 
 
  
The following table presents the changes in certain contract assets and (liabilities) (in thousands):
 
     March 31, 2021      December 31,
2020		      Change  
Accounts receivable
    $ 47,697      $ 40,999      $ 6,698  
Short-term deferred revenue and customer prepayments
      (6,008 )       (7,309 )       1,301  
Long-term deferred revenue
      (653 )       (733 )       80  
Deferred expenses
      1,726        1,650        76  
Sales allowances
      (1,253 )       (597 )       (656 ) 
The increase in accounts receivable was primarily due to an increase in net revenues of approximately $5,308,000 in March 2021 compared to December 2020.
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 $671,000 and $36,000 for the three months ended March 31, 2021 and 2020, respectively, that was included in deferred revenue at the beginning of
the
respective period.