Cash Equivalents And Restricted Securities (Tables)

6 Months Ended

Jun. 30, 2021

Cash Equivalents And Restricted Securities [Abstract]

Summary Of Cash Equivalents And Restricted Securities

			Unrealized		Estimated
			Holding		Market
June 30, 2021	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	10,005	$	--	$	10,005
Restricted securities:
Money market funds		554		--		554
Total assets	$	10,559	$	--	$	10,559
			Unrealized		Estimated
			Holding		Market
December 31, 2020	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	11,484	$	--	$	11,484
Restricted securities:
Money market funds		546		--		546
Total assets	$	12,030	$	--	$	12,030