Organization - Additional Information (Details) - USD ($)						3 Months Ended	12 Months Ended
	Aug. 03, 2020	Jul. 22, 2020	Jun. 22, 2020	Jun. 01, 2020	May 28, 2019	Mar. 22, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsidiary Sale Of Stock [Line Items]
Proceeds from issuance of common stock upon public offering, net of issuance costs							$ 100,664,000	$ 50,321,000
Accumulated deficit							126,986,000	$ 92,491,000
Cash, cash equivalents and marketable securities							$ 283,600,000
Common Stock
Subsidiary Sale Of Stock [Line Items]
Conversion of redeemable convertible preferred stock into common stock, shares								13,139,794
IPO
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares					5,750,000
Common stock, price per share					$ 10.00
Conversion of redeemable convertible preferred stock into common stock, shares					13,139,794
Proceeds from issuance of common stock in initial public offering, net of issuance costs					$ 50,200,000
Underwriting discounts and commissions					4,000,000
Offering costs					$ 3,300,000
IPO | Common Stock
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares								5,750,000
Overallotment Option
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares					750,000
Follow-on Public Offering
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares		500,000	6,666,667
Common stock price per share			$ 15.00
Gross proceeds from issuance common stock		$ 7,500,000	$ 100,000,000
Proceeds from issuance of common stock upon public offering, net of issuance costs		$ 100,700,000
Follow-on Public Offering | Common Stock
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares							7,166,667
Private Placement | Common Stock
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares							1,333,333
Private Placement | Glaxo Group Limited
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares	1,333,333
Common stock price per share	$ 15.00
Proceeds from issuance of common stock upon public offering, net of issuance costs	$ 20,000,000
At The Market Offering | Subsequent Event
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares						2,709,385
Proceeds from issuance of common stock upon public offering, net of issuance costs						$ 43,300,000
At The Market Offering | Common Stock
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares							410,896
At The Market Offering | Jefferies LLC | Common Stock
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares							410,896
Proceeds from issuance of common stock upon public offering, net of issuance costs							$ 6,600,000
At The Market Offering | Jefferies LLC | Common Stock | Subsequent Event
Subsidiary Sale Of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares						2,709,385
Proceeds from issuance of common stock upon public offering, net of issuance costs						$ 43,300,000
At The Market Offering | Jefferies LLC | Common Stock | Maximum
Subsidiary Sale Of Stock [Line Items]
Sale of common stock aggregate offering price				$ 50,000,000