CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net loss	$ (2,157)	$ (4,272)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	647	578
Amortization of intangible assets	274	276
Non-cash operating lease cost	134	133
Provision for expected credit losses	4	(6)
Write-down of inventory	144
Stock-based compensation expense	652	1,726
Change in fair value of warrant liabilities	(495)
Amortization on investments, net	(51)
Changes in operating assets and liabilities:
Accounts receivable	(13)	1,393
Notes receivable	86	(336)
Prepaid and other current assets	9	(427)
Inventories	(3,129)	(4,381)
Accounts payable	6	(499)
Accrued liabilities	(1,491)	(1,197)
Deferred revenue	205	445
Operating lease liabilities	(138)	(133)
Other	6	4
Net cash used in operating activities	(5,307)	(6,696)
Cash flows from investing activities
Purchase of property and equipment	(20)	(8)
Purchase of investments	(2,206)
Investment maturities	1,000
Net cash used in investing activities	(1,226)	(8)
Cash flows from financing activities
Payment of accrued offering costs allocable to preferred stock	(52)
Proceeds from Stock Options Exercised, Total	5
Net settlement of stock-based compensation awards	(83)
Net cash used in financing activities	(130)
Net decrease in cash and cash equivalents	(6,663)	(6,704)
Cash and cash equivalents at beginning of the period	20,621	14,674
Cash and cash equivalents at end of the period	13,958	7,970
Supplemental cash flow information
Cash paid for taxes		1
Cash paid for interest	13
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net	858	881
Transfer from (to) Inventories to (from) Property and equipment, net		$ (428)
Accounts payable for purchases of Property and equipment, net	$ (106)