Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 01, 2024 shares	Nov. 16, 2023 USD ($) grantee $ / shares shares	Jun. 30, 2021 shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 $ / shares shares	Dec. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation cost related to unvested awards not yet recognized | $				$ 66.0
Expected weighted-average period compensation cost to be recognized				2 years 8 months 12 days
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 1.26	$ 1.66
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance period				3 years
Service period from the milestone achievement date				1 year
Performance Shares | Achievement of applicable milestone
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
Performance Shares | Earlier of one year of service from achievement date and three-year performance period
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage				50.00%
2023 | Stock option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Minimum exercise price of plan modifications (in dollars per share) | $ / shares		$ 2.37
Original exercise price lower range (in dollars per share) | $ / shares		2.61
Original exercise price upper range (in dollars per share) | $ / shares		$ 17.95
Share-based payment arrangement, plan modification, number of grantees affected | grantee		200
Shares repriced (in shares)		23,416,860
Plan modification, exercise price (in dollars per share) | $ / shares		$ 1.87
Incremental stock-based compensation expense of modifications | $		$ 8.9
Maximum | Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period relative to total shareholder return				3 years
Awards granted, percentage of target				200.00%
Minimum | Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period relative to total shareholder return				2 years
Awards granted, percentage of target				0.00%
2021 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)			26,662,087
Award expiration period			10 years
Proportion of stock outstanding (as a percent)			5.00%
Number of additional shares authorized for issuance (in shares)	12,697,885
Increase in proportion of common shares reserved for future issuance (as a percent)	5.00%
Future issuance of common shares (in shares)				33,623,495
2021 Plan | Stock option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
2021 Plan | RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
2021 Plan | Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			3 years
2021 Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award expiration period			10 years
2021 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for future issuance (in shares)			2,470,000
Award expiration period			10 years
Proportion of stock outstanding (as a percent)			1.00%
Number of additional shares authorized for issuance (in shares)	2,539,577
Future issuance of common shares (in shares)				6,001,206
Purchase of common stock at discount (as a percent)			15.00%
Employee purchase of shares, proportion of fair value (as a percent)			85.00%
Maximum number of shares to be purchased under ESPP (in shares)			4,940,000
Maximum offering period			27 months
Stock-based compensation (in shares)				0	0
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award expiration period						10 years
Vesting period						4 years
Future issuance of common shares (in shares)						0