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Accounts receivable, net (Tables)
 12 Months Ended
Dec. 31, 2021
Accounts Receivable Net  
Accounts Receivable, net - Lessen by Provision for Doubtful Accounts

Accounts receivable consisted of the following:

Accounts Receivable, net - Lessen by Provision for Doubtful Accounts

    December 31,
2021		     December 31,
2020
Accounts receivable $ 26,764   $ 19,959
Less: Provision for credit losses   (2,990)     (2,990)
Accounts receivable, net $ 23,774   $ 16,969
Accounts Receivable, net - Changes to provisions for credit losses

Charges to provisions for credit losses are summarized as follows:

Allowance for credit losses   Balance at
beginning of period		     Charges to costs
and expenses		     Amount utilized     Balance at
end of period
Year ended December 31, 2021 $ (2,990)   $ —   $ —   $ (2,990)
Year ended December 31, 2020 $ (1,495)   $ (1,495)   $ —   $ (2,990)
Year ended December 31, 2019 $ (1,495)   $ —   $ —   $ (1,495)