Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (142,658)	$ (69,790)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	6,098	2,575
Noncash lease expense	2,844	2,434
Stock-based compensation expense	20,259	17,126
Loss on disposal of property, plant, and equipment	(4)	55
Goodwill impairment	19,462	0
Loss on disposal of lease assets	0	(1)
Amortization of deferred debt issuance costs	30	92
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	926	1,343
Other non-current assets	358	929
Accounts payable	(1,683)	1,710
Contract liabilities—related party	0	(4,805)
Operating lease liability	(99)	(2,264)
Accrued and other current and non-current liabilities	750	5,831
Net cash used in operating activities	(93,717)	(44,765)
Cash flows from investing activities
Purchase of property and equipment	(4,464)	(16,782)
Net cash used in investing activities	(4,464)	(16,782)
Cash flows from financing activities
Proceeds from issuance of common stock pursuant to at-the-market offering, net of issuance costs	0	43,360
Proceeds from exercise of stock options	4	1,315
Proceeds from Employee Stock Purchase Plan	382	432
Taxes withheld and paid related to net share settlement of equity awards	(150)	(3,234)
Deferred issuance costs	0	(364)
Net cash provided by financing activities	236	41,509
Net change in cash, cash equivalents	(97,945)	(20,038)
Cash, cash equivalents at the beginning of the period	257,656	277,694
Cash, cash equivalents at the end of the period	159,711	257,656
Reconciliation of cash, cash equivalents and restricted cash:
Cash, cash equivalents and restricted cash	159,711	257,656
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable and accrued expenses	279	565
Operating right-of-use asset obtained in exchange for operating lease liability	$ 0	$ 2,329