Fair Value Measurements of Financial Measurements - Summary of Fair Value of Financial Assets by Level within Fair Value Hierarchy (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Assets:
Total Financial Assets	$ 26	$ 1,026
Money Market Funds
Financial Assets:
Cash equivalents, Fair value disclosure	26	1,026
Level 1
Financial Assets:
Total Financial Assets	26	1,026
Level 1 | Money Market Funds
Financial Assets:
Cash equivalents, Fair value disclosure	$ 26	$ 1,026