STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (19,914)	$ (19,601)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	2,258	1,524
Amortization of intangible assets	1,148	1,240
Non-cash operating lease cost	521	517
Provision for expected credit losses	36	74
Write-down of inventory	50	320
Loss on disposal of property and equipment	11	133
Stock-based compensation expense	6,611	6,866
Changes in operating assets and liabilities:
Accounts receivable	(1,440)	(2,654)
Prepaid and other current assets	637	157
Inventories	(6,889)	2,333
Accounts payable	2,729	213
Accrued liabilities	96	75
Other	(710)	(166)
Net cash used in operating activities	(14,856)	(8,969)
Cash flows from investing activities
Purchase of property and equipment	(115)	(354)
Net cash used in investing activities	(115)	(354)
Cash flows from financing activities
Payment of contingent consideration	(2,400)
Proceeds from issuance of common stock under employee stock purchase plan	408	361
Net cash (used in) provided by financing activities	(1,992)	361
Net decrease in cash and cash equivalents	(16,963)	(8,962)
Cash and cash equivalents at beginning of the year	31,637	40,599
Cash and cash equivalents at end the year	14,674	31,637
Supplemental cash flow information
Cash paid for taxes	3	19
Supplemental schedule of non-cash investing and financing activities
Transfer from Inventories to Equipment under lease, net	1,553	$ 4,332
Transfer from Inventories to Property and equipment, net	$ 34