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Cash and Cash Equivalents and Marketable Securities - Summary of Cash and Cash Equivalents and Marketable Securities (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 9,968,000	$ 9,981,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	9,968,000	9,981,000
Money Market Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,471,000	2,455,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	2,471,000	2,455,000
U.S. Treasury Notes
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	7,497,000	7,526,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 7,497,000	$ 7,526,000

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