CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - 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	$ (14,230)	$ (16,795)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	858	802
Provision for bad debts	19	0
Equity-based compensation	1,297	555
Loss on disposal of property and equipment	71	11
Unrealized gain on equity investments	(53)	(50)
Units offering issuance cost	680	0
Loss on fair value adjustments	1,216	0
(Increase) decrease in assets:
Contributions to deferred compensation plan	(11)	0
Accounts receivable	386	(11)
Inventory	(85)	(140)
Prepaid expense and other	(448)	(239)
Increase (decrease) in liabilities:
Accounts payable	312	(977)
Accrued liabilities and other	(658)	1,945
Deferred revenue and income	(285)	(79)
Deferred compensation	33	181
Net cash used in operating activities	(8,452)	(13,367)
Cash flows from investing activities:
Purchases of equipment	(513)	(12)
Maturities of marketable securities	0	8,221
Net cash (used in) provided by investing activities	(513)	8,209
Cash flows from financing activities:
Units offering issuance cost	(764)	0
Payments on finance leases	(79)	(77)
Net cash provided by (used in) financing activities	11,439	(77)
Effect of exchange rate on cash	(6)	(262)
Increase (decrease) in cash and cash equivalents	2,468	(5,497)
Cash and cash equivalents, beginning of period	12,138	34,905	$ 34,905
Cash and cash equivalents, end of period	14,606	29,408	$ 12,138
Non-cash investing activities:
Net transfer of instruments from inventory to property and equipment	127	71
Non-cash financing activities:
Issuance of common stock in connection with extinguishment of 5.00% Notes	43	0
Accrued units offering issuance cost	473	0
Supplemental cash flow information:
Interest paid	10	0
Nonrelated Party
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of debt discount and issuance costs	1,596	182
Increase (decrease) in liabilities:
Accrued interest	850	235
Cash flows from financing activities:
Proceeds from issuance of Units	10,232	0
Related Party
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of debt discount and issuance costs	0	572
Increase (decrease) in liabilities:
Accrued interest	0	441
Cash flows from financing activities:
Proceeds from issuance of Units	$ 2,050	$ 0