Common Stock - Stock by Class (Details) - shares	Sep. 30, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	27,983,114	24,715,971
Shares underlying outstanding stock options
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	3,742,881	4,012,903
Shares underlying unvested restricted stock units
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	4,965,567	4,346,785
Shares underlying unvested market-based restricted stock units
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	0	2,260,764
Shares underlying unvested performance-based restricted stock units
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	1,291,889	412,490
Shares available for issuance under the 2018 Incentive Award Plan
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	11,441,400	7,053,406
Shares available for issuance under the 2018 Employee Stock Purchase Plan
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	2,414,509	1,679,635
Shares available for issuance under the 2023 Employment Inducement Incentive Award Plan
Class of Stock [Line Items]
Common stock, shares reserved for future issuance (in shares)	4,126,868	4,949,988