Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Deferred tax assets:
Net operating loss carryforwards	$ 280,549	$ 262,295
Capitalized research and development expenses	48,027	33,709
Accruals and reserves	4,237	3,865
Stock-based compensation	13,397	18,065
Deferred revenue	17,570	11,498
Operating lease liabilities	17,966	21,474
Property and equipment	1,192	0
Capital loss carryover	5,109	0
Other	303	332
Gross deferred tax assets	388,350	351,238
Valuation allowance	(364,871)	(322,104)
Total deferred tax assets	23,479	29,134
Deferred tax liabilities:
Prepaid expenses	(783)	(892)
Intangibles	(11,215)	(13,689)
Operating lease right-of-use assets	(11,481)	(14,117)
Property and equipment	0	(436)
Gross deferred tax liabilities	(23,479)	(29,134)
Net deferred taxes	$ 0	$ 0