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Basis of Presentation and Summary of Significant Accounting Policies (Contract Balances) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Accounts Receivable
Accounts receivable - contracts with customers	$ 5,458	$ 2,250
Accounts receivable - non-ASC 606	6,258	5,260
Total Accounts Receivable	11,716	7,510
Less: Allowance for doubtful accounts	(333)	(291)
Total Accounts Receivable, net	11,383	7,219
Deferred income	113	81
Revenue recognized	$ 35	$ 176

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