Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (147,946)	$ (116,606)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	15,345	13,969
Amortization and impairment of internal-use software	1,741	1,563
Stock-based compensation expense	37,473	37,222
Change in fair value of warrant liabilities	(32,989)	0
Loss (gain) on disposal of property and equipment	92	57
Gain on lease termination	(15)	(876)
Changes in operating assets and liabilities:
Accounts receivable (related party amounts of $(105) and nil for the nine months ended December 31, 2021 and 2020, respectively)	(21,078)	1,259
Inventories	(10,605)	(2,127)
Deferred cost of revenue	(10,630)	(5,831)
Prepaid expenses and other current assets (related party amounts of $(207) and nil as of December 31, 2021 and March 31, 2021, respectively)	(7,697)	5,483
Operating lease right-of-use assets	5,265	8,496
Other assets	(604)	37
Accounts payable (related party amounts of $(4,422) and $(4,231) for the nine months ended December 31, 2021 and 2020, respectively)	(804)	(215)
Accrued expenses and other current liabilities (related party amounts of $5,416 and $749 for the nine months ended December 31, 2021 and 2020, respectively)	9,878	636
Deferred revenue (related party amounts of $(3,969) and $(5,221) for the nine months ended December 31, 2021 and 2020, respectively)	40,223	29,576
Operating lease liabilities	(5,655)	(6,693)
Other liabilities	(3,617)	64
Net cash used in operating activities	(131,623)	(33,986)
Cash flows from investing activities:
Purchases of property and equipment	(2,421)	(3,860)
Purchases of intangible assets	(5,500)	0
Proceeds from sale of property and equipment	1	838
Capitalized internal-use software costs	(2,855)	(2,725)
Cash paid for acquisitions, net of cash acquired	(94,165)	0
Net cash used in investing activities	(104,940)	(5,747)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock	0	82,500
Payments for issuance costs of redeemable convertible preferred stock	0	(232)
Proceeds from exercise of stock options (related party amounts of nil and $34,710 for the nine months ended December 31, 2021 and 2020, respectively)	11,476	38,210
Payments of transaction costs	(30,642)	0
Proceeds from issuance of common stock upon Merger	309,720	0
Proceeds from PIPE	250,000	0
Proceeds from exercise of merger warrants	44	0
Payment for warrant redemptions	(116)	0
Net cash provided by financing activities	540,482	120,478
Effect of Exchange Rate on Cash and Cash Equivalents	(4)	0
Net increase (decrease) in cash and restricted cash	303,915	80,745
Cash and restricted cash—beginning of period	290,862	216,315
Cash and restricted cash—end of period	594,777	297,060
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment during the period included in accounts payable and accrued expenses	859	50
Stock-based compensation capitalized for internal-use software costs	745	501
Reclassification of deferred offering costs	3,971
Vesting of related party early exercised stock options		14,892
Assumption of merger warrants liability	75,415	0
Conversion of redeemable convertible preferred stock to common stock	837,351	0
Redemption/Exercise of Class A Common Stock Warrants	42,354	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
Cash	586,204	288,687
Restricted cash, current	1,599	1,399
Restricted cash, noncurrent	6,974	6,974
Total cash and restricted cash	$ 594,777	$ 297,060