Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net loss	$ (48,547)	$ (86,083)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	3,331	4,086
Depreciation and amortization	559	5,268
Non-cash lease expense	3,901	1,953
Impairment of long-lived assets	2,766	0
Changes in operating assets and liabilities:
Accounts receivable	304	(250)
Inventory	0	(2,027)
Prepaid expenses and other current assets	1,251	(747)
Other long-term assets	0	980
Accounts payable	(1,071)	(1,009)
Accrued expenses and other liabilities	(2,309)	(8,525)
Lease liabilities	(2,068)	(239)
Net cash used in operating activities	(41,883)	(86,593)
Investing activities
Purchase of property and equipment	(579)	(1,566)
Net cash used in investing activities	(579)	(1,566)
Financing activities
Proceeds from stock option exercises	0	98
Proceeds from stock issuances pursuant to employee stock purchase plan	33	308
Net cash provided by financing activities	33	406
Net decrease in cash, cash equivalents and restricted cash	(42,429)	(87,753)
Cash, cash equivalents and restricted cash at beginning of period	131,967	233,312
Cash, cash equivalents and restricted cash at end of period	89,538	145,559
Supplemental disclosure of noncash investing and financing activities
Right-of-use assets obtained in exchange for lease liability	7,265	19,245
Remeasurement of operating lease right-of-use asset for lease modification	$ (18,696)	$ 0