CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (35,326)	$ (35,174)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,345	955
Impairment of inventories	465	45
Change in fair value of warrant liability	437	(28)
Stock-based compensation	5,261	5,963
Amortization of right-of-use assets	845	744
Amortization of premium and accretion of discount on available-for-sale securities, net	(1,087)	(632)
Changes in operating assets and liabilities:
Accounts receivable	(350)	442
Inventories	(251)	(100)
Other current assets	312	790
Other noncurrent assets	70	0
Accounts payable	(89)	(1,749)
Accrued liabilities	(10)	(5,207)
Accrued employee costs	(3,600)	(1,307)
Lease liability	(866)	(754)
Other current liabilities	1,882	0
Net cash used in operating activities	(30,962)	(36,012)
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,648)	(1,275)
Purchase of available-for-sale securities	(38,881)	(54,520)
Proceeds from maturities of available-for-sale securities	62,565	56,214
Net cash provided by investing activities	22,036	419
Cash flows from financing activities:
Payments of taxes withheld on net settled vesting of restricted stock units	(55)	(20)
Proceeds from exercise of stock options	39	57
Net cash provided by (used in) financing activities	(16)	37
Net decrease in cash and cash equivalents	(8,942)	(35,556)
Beginning cash and cash equivalents	38,547	67,420
Ending cash and cash equivalents	29,605	31,864
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for income taxes	0	0
Supplemental disclosures of non-cash investing and financing activities:
Unpaid property, plant and equipment purchases	$ 0	$ 503