CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net loss	$ (86,176)	$ (55,135)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	10,129	13,933
Depreciation and amortization	177	187
Noncash lease expense	1,221	1,055
(Accretion)/amortization of available-for-sale marketable securities, net	(159)	498
Changes in operating assets and liabilities:
Accounts receivable, net - related party	(91)	(9,623)
Inventory, net	(883)	749
Other receivables	(1,186)	4
Prepaid expenses	3,609	(16,043)
Accounts payable and accrued expenses	37	10,455
Operating lease liabilities	(1,278)	(1,300)
Other	(108)
Net cash used in operating activities	(74,708)	(55,220)
Investing activities
Proceeds from maturities of available-for-sale marketable securities	118,590	162,185
Proceeds from redemptions of available-for-sale marketable securities, at par	4,000
Purchases of available-for-sale marketable securities	(48,601)	(77,858)
Purchases of property and equipment	(323)	(43)
Net cash provided by investing activities	73,666	84,284
Financing activities
Net proceeds from sales of common stock under open market sales agreement	1,117
Proceeds from the exercise of stock options	559	289
Net cash provided by financing activities	1,676	289
Net increase in cash, cash equivalents and restricted cash	634	29,353
Cash, cash equivalents and restricted cash at beginning of period	64,149	13,861
Cash, cash equivalents and restricted cash at end of period	64,783	$ 43,214
Noncash investing and financing activities
Accrual for leasehold improvements	$ 807