Investments And Fair Value Of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
Investments And Fair Value Of Financial Instruments [Abstract]
Schedule Of Available-For-Sale Securities	December 31, 2020 Cost Gross Unrealized Gains Gross Unrealized Losses Fair ValueU.S. Treasury securities $ 8,013 $— $ (1) $ 8,012Total assets measured at fair value $ 8,013 $— $— $ 8,012
Schedule Of Contractual Maturities Of Investments	December 31, 2021 2020Due in one year $ — $ 8,012Due in one to two years — —Total $ — $ 8,012
Fair Value Of Financial Assets Measured On A Recurring Basis	December 31, 2021 Assets Classification Level 1 Level 2 Level 3 Total Money market funds Cash and cash equivalents $ 23,675  $— $— $ 23,675  Total assets measured at fair value $ 23,675  $ - $— $ 23,675  December 31, 2020Assets Classification Level 1 Level 2 Level 3 Total Money market funds Cash and cash equivalents $ 7,176  $— $— $ 7,176  U.S. Treasury securities Cash and cash equivalents — 2,004  — 2,004  U.S. Treasury securities Investments — 8,012  — 8,012  Total assets measured at fair value $ 7,176  $ 10,016  $— $ 17,192