CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net loss	$ (26,665)	$ (27,749)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,353	5,704
Depreciation and amortization	58	63
Amortization expense component of lease expense	375	344
(Accretion)/amortization of available-for-sale marketable securities, net	(94)	292
Changes in operating assets and liabilities:
Accounts receivable, net - related party	(2,806)	(2,496)
Inventory, net	(1,132)	677
Other receivables	1	17
Prepaid expenses	(928)	(2,594)
Accounts payable and accrued expenses	(6,318)	640
Operating lease liabilities	(462)	(423)
Net cash used in operating activities	(34,618)	(25,525)
Investing activities
Proceeds from maturities of available-for-sale marketable securities	29,500	44,000
Proceeds from redemptions of available-for-sale marketable securities, at par	4,000
Purchases of available-for-sale marketable securities	(15,792)	(10,526)
Purchases of property and equipment		(43)
Net cash provided by investing activities	17,708	33,431
Financing activities
Proceeds from the exercise of stock options	560	3
Net cash provided by financing activities	560	3
Net (decrease) increase in cash, cash equivalents and restricted cash	(16,350)	7,909
Cash, cash equivalents and restricted cash at beginning of period	64,149	13,861
Cash, cash equivalents and restricted cash at end of period	$ 47,799	$ 21,770