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2. ACCOUNTS RECEIVABLE, NET
 12 Months Ended
Dec. 31, 2020
Accounts Receivable, after Allowance for Credit Loss [Abstract]  
ACCOUNTS RECEIVABLE, NET

The Company’s accounts receivable balance is net of an allowance for doubtful accounts of $10,000 and $10,000 at December 31, 2020 and 2019, respectively. Changes in the allowance for doubtful accounts are as follows:

 

   Year ended December 31,
   2020  2019
Balance at Beginning of Period  $10,000   $10,000 
Charged to costs and expenses   —      —   
Write-offs, net of recoveries   —      —   
Balance at End of Period  $10,000   $10,000