Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (42,026)	$ (35,770)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,093	5,058
Amortization and impairment of internal-use software	545	474
Stock-based compensation expense	9,637	11,361
Change in fair value of warrant liabilities	534	0
Gain on lease termination	15	876
Changes in operating assets and liabilities:
Accounts receivable	6,923	(1,881)
Inventories	9,033	(2,846)
Deferred cost of revenue	(638)	(542)
Prepaid expenses and other current assets	1,057	(4,529)
Operating lease right-of-use assets	1,812	5,021
Other assets	(101)	(162)
Accounts payable (related party amounts of $2,182 and $(4,231) for the three months ended June 30, 2021 and 2020, respectively)	5,721	(6,724)
Accrued expenses and other current liabilities (related party amounts of $(134) and $(1,744) for the three months ended June 30, 2021 and 2020, respectively)	(286)	(6,929)
Deferred revenue (related party amounts of $(11,209) and $(11,827) for the three months ended June 30, 2o021 and 2020, respectively)	(5,152)	(10,409)
Operating lease liabilities	(1,868)	(3,008)
Other liabilities	22	21
Net cash used in operating activities	(44,533)	(32,905)
Cash flows from investing activities:
Purchases of property and equipment	(666)	(3,539)
Proceeds from sale of property and equipment	0	606
Capitalized internal-use software costs	(721)	(1,015)
Net cash used in investing activities	(1,387)	(3,948)
Cash flows from financing activities:
Proceeds from exercise of stock options	2,720	1,026
Payments of deferred offering costs	(29,071)	0
Proceeds from issuance of common stock upon Merger	309,720	0
Net cash provided by financing activities	533,369	1,026
Net increase (decrease) in cash and restricted cash	487,449	(35,827)
Cash and restricted cash—beginning of period	290,862	216,316
Cash and restricted cash—end of period	778,311	180,489
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment during the period included in accounts payable and accrued expenses	777	12
Stock-based compensation capitalized for internal-use software costs	168	143
Reclassification of deferred offering costs	3,971	0
Vesting of related party early exercised stock options	0	4,241
Assumption of merger warrants liability	75,415	0
Deferred offering costs during the period included in accounts payable and accrued expenses	1,571	0
Conversion of redeemable convertible preferred stock to common stock	837,351	0
Reconciliation of cash and restricted cash within the consolidated balance sheets to the amounts shown in the consolidated statements of cash flows above:
Cash	769,938	172,116
Restricted cash	1,399	1,399
Restricted cash, noncurrent	6,974	6,974
Total cash and restricted cash	778,311	180,489
PIPE [Member]
Cash flows from financing activities:
Proceeds from issuance of common stock upon Merger	$ 250,000	$ 0