CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 19,293	$ 31,637
Accounts receivable, net of allowance of $31 and $47, respectively	3,560	4,638
Notes receivable, net of allowance of $3 and $61, respectively	126	350
Inventories	7,890	6,488
Prepaid and other current assets	1,302	1,700
Total current assets	32,171	44,813
Property and equipment, net	639	756
Equipment under lease, net	6,732	6,690
Notes and other receivables, long-term, net of allowance of $0 and $2, respectively		121
Intangible assets, net	12,398	10,870
Other assets	2,861	3,215
Total assets	54,801	66,465
Current liabilities:
Accounts payable	3,506	2,694
Accrued liabilities	4,948	4,604
Deferred revenue	789	904
Operating lease liabilities	526	512
Other current liabilities	19
Total current liabilities	9,788	8,714
Long-term operating lease liabilities	2,408	2,803
Other long-term liabilities	22	69
Total liabilities	12,218	11,586
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 10,000 shares authorized at September 30, 2022 and December 31, 2021; no shares issued and outstanding at September 30, 2022 and December 31, 2021
Common stock, par value $0.01 per share, 150,000 shares authorized at September 30, 2022 and December 31, 2021; 11,023 and 10,990 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively	110	110
Additional paid-in capital	137,491	132,363
Accumulated deficit	(95,018)	(77,594)
Total stockholders’ equity	42,583	54,879
Total liabilities and stockholders’ equity	$ 54,801	$ 66,465