Warrants (Fair Value of Warrants) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Class of Warrant or Right [Line Items]
Fair Value	$ 2		$ 2		$ 1,374
Change in Fair Value of common stock warrant liability	226	$ 2,642	1,372	$ (4,566)
2018 January and February Issuance [Member]
Class of Warrant or Right [Line Items]
Fair Value	$ 2		$ 2		1,355
2017 May issuance [Member]
Class of Warrant or Right [Line Items]
Fair Value					$ 19