Accounts Receivable and Contract Assets (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Accounts Receivable and Contract Assets [Abstract]
Accounts receivable - customers	$ 4,651	$ 4,731
Other receivables	211	385
Accounts receivable	4,862	5,116
Less: allowance for doubtful accounts	(317)	(305)
Accounts receivable, net	4,545	4,811
Unbilled revenue	2,394	$ 2,427
Change in accounts receivable - customers	(80)
Change in other receivables	(174)
Change in accounts receivable	(254)
Change in allowance for doubtful accounts	(12)
Change in accounts receivable, net	(266)
Change in unbilled revenue	$ (33)

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 of allowance for credit loss on accounts receivable, classified as current.

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Amount of increase (decrease) in allowance for credit loss on accounts receivable.

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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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Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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The increase (decrease) during the reporting period in amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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The increase (decrease) during the reporting period in the amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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The increase (decrease) during the reporting period in the 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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The increase (decrease) during the reporting period in receivables classified as other, due within one year or the operating cycle, if longer.

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