Net Loss Per Share Attributable to Common Stockholders - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				6 Months Ended
		Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net loss attributable to common stockholders		$ (59,103)	$ (69,400)	$ (75,270)	$ (104,624)	$ (128,503)	$ (179,894)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)	[1]	25,519,658		23,742,914		25,151,988	23,429,600
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	[1]	25,519,658		23,742,914		25,151,988	23,429,600
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)	[1]	$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)
Net loss per share attributable to common stockholders, diluted (in usd per share)	[1]	$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)
Class A Common Stock
Numerator:
Net loss attributable to common stockholders		$ (39,822)		$ (48,699)		$ (85,949)	$ (115,546)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		17,194,568		15,361,280		16,822,770	15,048,689
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		17,194,568		15,361,280		16,822,770	15,048,689
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)		$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)
Net loss per share attributable to common stockholders, diluted (in usd per share)		$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)
Class B Common Stock
Numerator:
Net loss attributable to common stockholders		$ (19,281)		$ (26,571)		$ (42,554)	$ (64,348)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic (in shares)		8,325,090		8,381,634		8,329,218	8,380,911
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted (in shares)		8,325,090		8,381,634		8,329,218	8,380,911
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic (in usd per share)		$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)
Net loss per share attributable to common stockholders, diluted (in usd per share)		$ (2.32)		$ (3.17)		$ (5.11)	$ (7.68)

[1] Amounts have been adjusted to reflect the reverse stock split that became effective on October 16, 2024. Refer to Note 2, “Summary of Significant Accounting Policies” and Note 19, “Subsequent Events,” for further information about the reverse stock split.