Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES
Net loss	$ (70,441)	$ (51,430)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	25,513	19,256
Depreciation and amortization	2,839	1,722
Loss on disposal of property and equipment	261	0
Net amortization of premium and unrealized loss on available-for-sale securities	307	819
Non-cash operating lease expense	1,497	764
Changes in operating assets and liabilities:
Accounts receivable, net	(2,042)	(1,165)
Related party receivables	454	(604)
Other receivables	(646)	(513)
Prepaid expenses and other current assets	(742)	(1,959)
Inventory	(2,372)	(2,006)
Other assets	(294)	(52)
Accounts payable	(443)	302
Deferred revenue	(51)	(139)
Accrued expenses	(190)	1,150
Operating lease liabilities	(355)	(49)
Other current liabilities	181
Other noncurrent liabilities	0	(74)
Net cash used in operating activities	(46,524)	(33,978)
INVESTING ACTIVITIES
Purchases of property and equipment	(5,292)	(5,588)
Proceeds from Sale of Property, Plant, and Equipment	170	0
Purchase of available-for-sale securities	(202,748)	(169,801)
Proceeds from maturities of available-for-sale securities	87,863	92,000
Net cash used in investing activities	(120,007)	(83,389)
FINANCING ACTIVITIES
Proceeds from issuance of common stock upon follow-on public offering, net of issuance costs	0	102,959
Proceeds from return of profit	0	11,403
Repurchase of Class A common stock	(20)	(35)
Proceeds from exercise of Class A common stock options including early exercised options	1,387	1,038
Proceeds from issuance of common stock in connection with employee stock purchase plan	420	0
Net cash provided by financing activities	1,787	115,365
Net decrease in cash, cash equivalents and restricted cash	(164,744)	(2,002)
Cash, cash equivalents and restricted cash, beginning of period	233,337	333,928
Cash, cash equivalents and restricted cash, end of period	68,593	331,926
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Lease liability obtained in exchange for right-of-use assets	6,855	23,232
Accounts Payable
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Property and equipment purchases included in accounts payable and in accrued expenses	814	183
Accrued Liabilities
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Property and equipment purchases included in accounts payable and in accrued expenses	$ 14	$ 271