Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net loss	$ (92,966)	$ (71,169)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	33,673	25,927
Depreciation and amortization	3,942	2,558
Loss on disposal of property and equipment	332	0
Net amortization of premium on available-for-sale securities	(833)	1,197
Provision for inventory excess and obsolescence	507	0
Non-cash operating lease expense	1,959	1,005
Changes in operating assets and liabilities:
Accounts receivable, net	(1,820)	(2,495)
Related party receivables	(521)	(1,184)
Other receivables	(533)	(203)
Prepaid expenses and other current assets	(727)	(2,884)
Inventory	(1,590)	(3,594)
Other assets	(354)	(94)
Accounts payable	(1,553)	1,603
Deferred revenue	(243)	126
Deferred rent	0	0
Accrued expenses	40	2,277
Accrued research and development	0	627
Operating lease liabilities	(304)	91
Other current liabilities	207	0
Other noncurrent liabilities	4	(135)
Net cash used in operating activities	(60,780)	(46,347)
INVESTING ACTIVITIES
Purchases of property and equipment	(10,265)	(6,922)
Proceeds from disposal of property and equipment	170	0
Purchase of available-for-sale securities	(366,268)	(279,956)
Proceeds from maturities of available-for-sale securities	253,645	116,000
Net cash used in investing activities	(122,718)	(170,878)
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	3,138	1,885
Proceeds from issuance of common stock in connection with employee stock purchase plan	775	422
Net cash provided by financing activities	3,893	116,634
Net decrease in cash, cash equivalents and restricted cash	(179,605)	(100,591)
Cash, cash equivalents and restricted cash, beginning of period	233,337	333,928
Cash, cash equivalents and restricted cash, end of period	53,732	233,337
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for income taxes	232	645
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Property, Plant and Equipment, Transfers and Changes	928	0
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	54	186
Accrued Liabilities
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES
Property and equipment purchases	$ 300	$ 269