Stockholders' Equity and Stock-Based Compensation - Schedule of Shares of Common Stock Reserved for Future Issuance (Details) shares in Thousands	Sep. 30, 2026 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved for issuance (in shares)	117,409
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved for issuance (in shares)	93,609
2021 Equity Incentive Plan \| RSUs \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement with individual, equity percentage	100.00%
2021 Equity Incentive Plan \| RSUs \| Executive Chairman
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement with individual, equity percentage	100.00%
2022 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved for issuance (in shares)	5,957
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares of common stock reserved for issuance (in shares)	17,843

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details