STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net loss	$ (14,383)	$ (19,914)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	2,418	2,258
Amortization of intangible assets	1,097	1,148
Non-cash operating lease cost	534	521
Provision for expected credit losses	1	36
Write-down of inventory	66	50
Loss on disposal of property and equipment	7	11
Stock-based compensation expense	5,539	6,611
Change in fair value of warrant liabilities	2,852
Amortization on investments, net	(12)
Changes in operating assets and liabilities:
Accounts receivable	2,057	(1,440)
Notes receivable	(980)	(180)
Prepaid and other current assets	(1,305)	637
Inventories	(7,461)	(6,889)
Accounts payable	(1,417)	2,729
Accrued liabilities	892	96
Deferred revenue	915	(174)
Operating lease liabilities	(539)	(512)
Other	60	156
Net cash used in operating activities	(9,659)	(14,856)
Cash flows from investing activities
Purchase of property and equipment	(236)	(115)
Purchase of investments	(3,920)
Net cash used in investing activities	(4,156)	(115)
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred stock, net of offering costs	13,882
Proceeds from issuance of warrants	5,605
Proceeds from issuance of common stock under employee stock purchase plan	327	408
Net settlement of stock-based compensation awards	(52)
Payment of contingent consideration		(2,400)
Net cash provided by (used in) financing activities	19,762	(1,992)
Net increase (decrease) in cash and cash equivalents	5,947	(16,963)
Cash and cash equivalents at beginning of the year	14,674	31,637
Cash and cash equivalents at end the year	20,621	14,674
Supplemental cash flow information
Cash paid for taxes	18	3
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net	3,938	1,553
Transfer from (to) Inventories to (from) Property and equipment, net	(491)	$ 34
Accrued offering costs	$ (135)