Equity-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 20, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2,328	$ 234	$ 3,363	$ 899
Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	685	184	1,422	489
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 1,643	$ 50	1,941	410
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercised			$ 500	$ 100
Weighted-average fair value of options granted	$ 12.04	$ 7.63	$ 1.65	$ 1.67
Unrecognized stock-based compensation expense	$ 23,200		$ 23,200
Unrecognized compensation cost, recognition period			3 years 4 months 24 days
Fair value of stock options vested	1,900	$ 2,700	$ 100	$ 500
Stock-based compensation expense	2,273	161	3,190	358
Stock Options | Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	635	116	1,263	164
Stock Options | General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,638	45	$ 1,927	194
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost, recognition period			1 year 7 months 6 days
Unrecognized stock-based compensation expense	300		$ 300
Fair value of restricted stock vested			100	400
Stock-based compensation expense	100	100	200	400
Restricted Stock | Research and Development Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 100	$ 100	$ 200	200
Restricted Stock | General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				200
Restricted Stock | General and Administrative Expense | Modification of Employee's Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 100
2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for issuance under plan					4,457,370
Maximum number of shares to be issued, percentage			4.00%
Shares remaining available for future grants	3,340,887		3,340,887
2020 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for issuance under plan					445,653
Share-based compensation, description			The 2020 ESPP provides that the number of shares reserved and available for issuance will automatically increase on January 1, 2021 and each January 1 thereafter through January 1, 2030, by the least of (i) 438,898 shares of common stock, (ii) 1% of the Company’s outstanding number of shares of common stock on the immediately preceding December 31 or (iii) such lesser number of shares of common stock as determined by the administrator of the 2020 ESPP.
2020 ESPP | Lesser of Potential Outcome 1
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares authorized			438,898
2020 ESPP | Lesser of Potential Outcome 2
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares to be issued, percentage			1.00%
2018 Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	0	0	0	0