CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 25,196	$ 31,637
Accounts receivable, net of allowance of $25 and $47, respectively	2,760	4,638
Notes receivable, net of allowance of $181 and $61, respectively	164	350
Inventories	5,856	6,488
Prepaid and other current assets	1,230	1,700
Total current assets	35,206	44,813
Property and equipment, net	680	756
Equipment under lease, net	7,161	6,690
Notes and other receivables, long-term, net of allowance of $1 and $2, respectively	29	121
Intangible assets, net	12,674	10,870
Other assets	2,950	3,215
Total assets	58,700	66,465
Current liabilities:
Accounts payable	4,191	2,694
Accrued liabilities	4,372	4,604
Contingent consideration	1,200
Deferred revenue	937	904
Operating lease liabilities	521	512
Total current liabilities	11,221	8,714
Long-term operating lease liabilities	2,540	2,803
Other long-term liabilities	37	69
Total liabilities	13,798	11,586
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 10,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, par value $0.01 per share, 150,000 shares authorized at June 30, 2022 and December 31, 2021; 11,021 and 10,990 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	110	110
Additional paid-in capital	135,819	132,363
Accumulated deficit	(91,027)	(77,594)
Total stockholders’ equity	44,902	54,879
Total liabilities and stockholders’ equity	$ 58,700	$ 66,465