Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (217,490)	$ (183,619)	$ (250,863)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	23,699	18,078	22,249
Amortization and impairment of internal-use software	2,449	2,168	1,040
Stock-based compensation expense	57,933	88,425	44,838
Change in fair value of warrant liabilities	(32,989)	0	0
Loss on disposal of property and equipment	100	57	6
Gain on lease termination	(15)	(876)	0
Impairment of long-lived assets	0	0	33,213
Changes in operating assets and liabilities:
Accounts receivable (related party amounts of nil, nil and $2,000 for the years ended March 31, 2022, 2021 and 2020, respectively)	(899)	3,912	4,207
Inventories	(4,262)	7,884	(440)
Deferred cost of revenue	(2,219)	1,163	7,184
Prepaid expenses and other current assets	(10,077)	2,126	3,379
Operating lease right-of-use assets	7,078	10,288	14,557
Other assets	(1,820)	573	480
Accounts payable (related party amounts of $8,145, $191 and $4,231 for the years ended March 31, 2022, 2021 and 2020, respectively)	22,856	137	(29,809)
Accrued expenses and other current liabilities (related party amounts of $ (1,293), $3,517 and $(2,599) for the years ended March 31, 2022, 2021 and 2020, respectively)	8,316	82	4,916
Deferred revenue (related party amounts of $(20,959), $(14,917) and $251 for the years ended March 31, 2022, 2021 and 2020, respectively)	(8,799)	(16,210)	(35,333)
Operating lease liabilities	(7,054)	(8,528)	(5,431)
Other liabilities	(3,635)	88	41
Net cash used in operating activities	(166,828)	(74,252)	(185,766)
Cash flows from investing activities:
Purchases of property and equipment	(3,968)	(4,054)	(68,371)
Purchases of intangible assets (patents)	(5,500)	0	0
Proceeds from sale of property and equipment	1	838	765
Capitalized internal-use software costs	(4,505)	(3,320)	(5,217)
Cash paid for acquisitions, net of cash acquired	(94,165)	0	0
Net cash used in investing activities	(108,137)	(6,536)	(72,823)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock	0	82,500	0
Payments for issuance costs of redeemable convertible preferred stock	0	(232)	0
Proceeds from exercise of stock options (related party amounts of nil, $67,359 and nil for the years ended March 31, 2022, 2021 and 2020, respectively)	16,998	76,151	8,830
Payments Of Deferred Offering Costs	(30,642)	(3,084)	0
Proceeds from issuance of common stock upon Merger	309,720	0	0
Proceeds from PIPE (related party amounts of $25,000, nil and nil for the years ended March 31, 2022, 2021 and 2020, respectively)	250,000	0	0
Proceeds from exercise of merger warrants	44	0	0
Payment for warrant redemptions	(116)	0	0
Net cash provided by financing activities	546,004	155,335	8,830
Effect of Exchange Rate on Cash	(146)	0	0
Net increase (decrease) in cash and restricted cash	270,893	74,547	(249,759)
Cash and restricted cash—beginning of period	290,862	216,315	466,074
Cash and restricted cash—end of period	561,755	290,862	216,315
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment during the period included in accounts payable and accrued expenses	722	535	3,221
Stock-based compensation capitalized for internal-use software costs	1,166	637	792
Reclassification of transaction costs	3,971	0	0
Vesting of related party early exercised stock options	0	91,046	16,962
Assumption of Merger Warrants Liability	75,415	0	0
Deferred offering costs during the period included in accounts payable and accrued expenses	0	887	0
Conversion of redeemable convertible preferred stock to common stock	837,351	0	0
Redemption/Exercise of Class A Common Stock Warrants	42,354	0	0
Stock consideration in acquisition of businesses, including fair value of common stock issued and fair value of stock-based awards that were vested	322,842	0	0
Cash	553,182	282,489	207,942
Restricted cash, current	1,599	1,399	1,399
Restricted cash, non-current	6,974	6,974	6,974
Total cash and restricted cash	$ 561,755	$ 290,862	$ 216,315