Description of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 16, 2020 USD ($) $ / shares shares	Jun. 04, 2020	Jun. 30, 2020 shares	Jun. 30, 2020 shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Description Of Business And Basis Of Presentation [Line Items]
Common stock, shares authorized	400,000,000				400,000,000	52,042,000
Preferred stock, shares authorized	40,000,000				40,000,000	0
Reverse stock split, description					On June 4, 2020, the Company effected a one-for-2.1095 reverse stock split of its common stock (the Reverse Stock Split).
Stockholders' equity note, stock split, conversion ratio		2.1095
Accumulated deficit | $					$ 50,265	$ 22,185
Cash and cash equivalents | $					$ 341,142	$ 94,578
Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Outstanding shares of convertible preferred stock converted into common stock				17,921,000
Initial Public Offering
Description Of Business And Basis Of Presentation [Line Items]
Sale of stock number of shares issued in transaction	16,560,000
Sale of stock, price per share | $ / shares	$ 18.00
Proceeds from the IPO, net of underwriting discounts, commissions and offering costs | $	$ 274,100
Outstanding shares of convertible preferred stock converted into common stock	17,921,069
Initial Public Offering | Undesignated Preferred Stock
Description Of Business And Basis Of Presentation [Line Items]
Preferred stock, shares authorized	40,000,000
Initial Public Offering | Common Stock
Description Of Business And Basis Of Presentation [Line Items]
Outstanding shares of convertible preferred stock converted into common stock			17,921,069
Warrant to purchase of common stock	7,809
Common stock, shares authorized	400,000,000