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Summary of Significant Accounting Policies (Changes in Fair Value of Financing Derivative) (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Jun. 23, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, Beginning			$ 183	$ 356
(Gain) Loss on change in fair value of Financing Derivative			(167)	653
Change in fair value due to partial exercise of derivative associated with $4.5 million principal payoff				(826)
Balance, Ending			$ 16	183
Repayment of notes payable				4,500
Notes [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Repayment of notes payable	$ 4,500	$ 4,500		$ 4,500

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The cash outflow for a borrowing supported by a written promise to pay an obligation.

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