Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (5,955)	$ (2,141)
Change in net deferred tax assets	471	(166)
Accounts payable and accrued expenses	(3,552)	(2,145)
Net cash provided by operating activities	$ (8,672)	(3,842)
Tax Year 2019 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		(2,141)
Change in net deferred tax assets		(166)
Accounts payable and accrued expenses		(2,145)
Net cash provided by operating activities		(3,842)
Tax Year 2019 [Member] | As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		(2,097)
Change in net deferred tax assets		(151)
Accounts payable and accrued expenses		(2,204)
Net cash provided by operating activities		(3,842)
Tax Year 2019 [Member] | Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		(44)
Change in net deferred tax assets		(15)
Accounts payable and accrued expenses		$ 59