Stockholders’ Deficit - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	9 Months Ended
	Sep. 28, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	5,406,662	4,477,120
Shares available for grant/issuance (in shares)	7,462,253	8,230,500
Total common stock reserved for future issuance (in shares)	27,214,070	25,301,522
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable (in shares)	225,967	0
Vesting percentage	200.00%
Equity incentive compensation awards granted and outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	8,032,742	5,888,077
Shares available for grant under the 2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant/issuance (in shares)	7,462,253	8,230,500
Shares available for issuance under the Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant/issuance (in shares)	3,484,845	2,948,715
Shares available for issuance under the Employee Stock Purchase Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable (in shares)	225,967
Vesting percentage	200.00%
Shares reserved for potential issuance under the Notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant/issuance (in shares)	8,234,230	8,234,230