Equity Incentive Plans and Stock-Based Compensation - Summary of the Activity Under the Stock Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Mar. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Balance, Beginning of period (in shares)		68,050,752
Granted (in shares)	0	13,097,016
Exercised (in shares)		(1,517,517)
Cancelled/forfeited/expired (in shares)		(5,983,369)
Balance, End of period (in shares)	73,646,882	73,646,882	68,050,752
Vested and exercisable as of End of period (in shares)	51,938,674	51,938,674
Weighted-Average Exercise Price
Balance, Beginning of period (in usd per share)		$ 4.20
Granted (in usd per share)		1.25
Exercised (in usd per share)		0.45
Cancelled/Forfeited/Expired (in usd per share)		5.02
Balance, End of period (in usd per share)	$ 3.69	3.69	$ 4.20
Vested and exercisable as of End of period (in usd per share)	$ 4.14	$ 4.14
Weighted-Average Remaining Contractual Life (Years)
Balance, Beginning of period		5 years 7 months 6 days	6 years
Balance, End of period		5 years 7 months 6 days	6 years
Vested and Exercisable as of End of period		4 years 4 months 24 days
Aggregate Intrinsic Value
Balance, Beginning of period	$ 1,555	$ 1,555	$ 10,621
Balance, End of period	1,555	1,555	$ 10,621
Vested and exercisable as of End of period	$ 1,555	$ 1,555