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Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) segment shares	Dec. 31, 2018 shares	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Potentially dilutive common shares related to the outstanding preferred stock, stock options, restricted stock units and warrants \| shares	12.4	14.0
Number of operating segments (segment) \| segment	1
Right-of-use lease asset	$ 15,491
Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	2 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of the assets	7 years
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Right-of-use lease asset			$ 16,800
Operating lease, liability			$ 31,800