Cash Equivalents And Restricted Securities (Tables)

3 Months Ended

Mar. 31, 2021

Cash Equivalents And Restricted Securities [Abstract]

Summary Of Cash Equivalents And Restricted Securities

			Unrealized		Estimated
			Holding		Market
March 31, 2021	Cost Basis		Gains		Value
Cash equivalents:
Money market funds	$	10,006	$	--	$	10,006
Restricted securities:
Money market funds		550		--		550
Total assets	$	10,556	$	--	$	10,556
			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