BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 14,674	$ 31,637
Accounts receivable, net of allowance of $47 and $19, respectively	6,040	4,638
Notes receivable, net of allowance of $61 and $9, respectively	200	350
Inventories	11,740	6,488
Prepaid and other current assets	1,062	1,700
Total current assets	33,716	44,813
Property and equipment, net	563	756
Equipment under lease, net	6,316	6,690
Notes and other receivables, long-term, net of allowance of $2 and $9, respectively	442	121
Intangible assets, net	12,122	10,870
Other assets	2,685	3,215
Total assets	55,844	66,465
Current liabilities:
Accounts payable	5,422	2,694
Accrued liabilities	4,700	4,604
Deferred revenue	768	904
Operating lease liabilities	531	512
Total current liabilities	11,421	8,714
Long-term operating lease liabilities	2,272	2,803
Other long-term liabilities	167	69
Total liabilities	13,860	11,586
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 10,000 shares authorized at December 31, 2022 and 2021; no shares issued and outstanding at December 31, 2022 and 2021
Common stock, par value $0.01 per share, 150,000 shares authorized at December 31, 2022 and 2021; 11,093 and 10,990 shares issued and outstanding at December 31, 2022 and 2021, respectively	111	110
Additional paid-in capital	139,381	132,363
Accumulated deficit	(97,508)	(77,594)
Total stockholders’ equity	41,984	54,879
Total liabilities and stockholders’ equity	$ 55,844	$ 66,465