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Accounts Receivable and Contract Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable and Contract Assets [Abstract]
Accounts receivable - customers	$ 4,716	$ 5,633
Other receivables	75	206
Accounts receivable	4,791	5,839
Less: allowance for doubtful accounts	(856)	(655)
Accounts receivable, net	3,935	5,184
Unbilled revenue	3,047	$ 2,847
Change in accounts receivable - customers	(917)
Change in other receivables	(131)
Change in accounts receivable	(1,048)
Change in allowance for doubtful accounts	(201)
Change in accounts receivable, net	(1,249)
Change in unbilled revenue	$ 200

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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