Trade Accounts Receivable and Allowance for Doubtful Accounts

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Trade Accounts Receivable and Allowance for Doubtful Accounts

(6) Trade Accounts Receivable and Allowance for Doubtful Accounts

Trade Accounts Receivable

Trade accounts receivable are recorded at the contractual or invoiced amount.

	December 31,			December 31,
	2021			2020
Trade accounts receivable, current	$	6,393		$	3,932
Trade accounts receivable, long-term		186			—
Allowance for doubtful accounts		(25	)		(25	)
Trade accounts receivable, net	$	6,554		$	3,907
Unpaid deferred revenue included in trade    accounts receivable	$	1,891		$	1,711

 Allowance for doubtful accounts

The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses in the Company’s existing trade accounts receivable. The Company determines the allowance based on historical write-off experience and current information. The Company reviews its allowance for doubtful accounts each reporting period. Account balances are charged against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote.

Unpaid deferred revenue

The unpaid deferred revenue that is included in trade accounts receivable is billed in accordance with the provisions of the contracts with the Company’s customers.

Major customers

The following customers accounted for 10% or more of trade accounts receivable, net:

	December 31,			December 31,
	2021			2020
Company A		43	%		69	%
Company B		15	%		0	%
Company C		11	%		0	%