Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities
Net loss	$ (24,061)	$ (17,622)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	325	331
Stock-based compensation	3,198	1,675
Change in fair value of warrant liability	337
Non-cash change in fair value of term loan	(247)
Non-cash lease expense	325	300
Other	27	128
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(693)	(400)
Accounts payable	3,980	359
Accrued expenses and other liabilities	422	(250)
Deferred revenue	(3,411)	(4,706)
Net cash used in operating activities	(19,798)	(20,185)
Cash flows from investing activities
Purchase of property, plant and equipment	(140)	(3,900)
Net cash used in investing activities	(140)	(3,900)
Cash flows from financing activities
Debt issuance costs for term loan	(18)
Payment of offering costs		(387)
Proceeds from common stock issuances under ESPP	26	50
Other	(30)	(33)
Net cash used in financing activities	(22)	(370)
Net decrease in cash, cash equivalents and restricted cash	(19,960)	(24,455)
Cash, cash equivalents and restricted cash at the beginning of the period	146,540	90,517	$ 90,517
Cash, cash equivalents and restricted cash at the end of the period	126,580	66,062	146,540
Cash and cash equivalents	123,980	63,425	$ 143,940
Restricted cash	2,600	2,637
Supplemental disclosure of cash flow information:
Cash paid for interest	1,329	1,125
Supplemental disclosure of noncash investing and financing activities:
Property, plant and equipment in accounts payable and accrued expenses	$ 52	$ 112