Nature of Business and Liquidity - Additional Information (Details) $ / shares in Units, $ in Thousands			3 Months Ended						9 Months Ended		12 Months Ended
	May 11, 2021 USD ($) $ / shares shares	Apr. 30, 2021	Sep. 30, 2021 USD ($) shares	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Underwriting discounts and commissions and other expenses				$ 12,858,764
Preferred stock outstanding | shares	0		0						0
Reverse stock split ratio		0.1869
Net loss			$ 12,941	$ 11,352	$ 9,299	$ 6,417	$ 4,663	$ 4,848	$ 33,592	$ 15,928	$ 22,700
Cash used for operation									30,158	$ 13,562	19,200
Accumulated deficit			76,606						76,606		43,014
Cash and cash equivalents			27,311						27,311		$ 17,589
Marketable securities			$ 227,400						227,400
Common Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued and sold | shares				8,825,000
Underwriting discounts and commissions and other expenses									$ 2,369
Common Stock | Initial Public Offering
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued and sold | shares	8,825,000
Offering price | $ / shares	$ 17.00
Gross proceeds from sale of shares	$ 150,000
Underwriting discounts and commissions and other expenses	$ 12,900