Cash Equivalents And Restricted Securities (Tables)

9 Months Ended

Sep. 30, 2021

Cash Equivalents And Restricted Securities [Abstract]

Summary Of Cash Equivalents And Restricted Securities

			Unrealized		Estimated
			Holding		Market
September 30, 2021	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	10,012	$	--	$	10,012
Restricted securities:
Money market funds		538		--		538
Total assets	$	10,550	$	--	$	10,550
			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