Stock-Based Compensation Expense - Common stock reserved for future issuance (Details) - shares	Jun. 30, 2025	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of common stock reserved	8,706,630	7,574,662
Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of common stock reserved	1,042,392	585,458
Shares Subject to Stock Options Issued and Outstanding Under the 2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of common stock reserved	6,739,814	5,906,298
Shares Available for Future Issuance Under the 2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of common stock reserved	461,184	563,311
The 2021 ESPP Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares of common stock reserved	463,240	519,595