Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operating income (loss)	$ (4,957)	$ (6,195)
Retained Earnings (Accumulated Deficit)	(576,068)		$ (570,843)
Cash and Cash Equivalents, at Carrying Value	$ 21,775		$ 27,109