CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 7,970	$ 14,674
Accounts receivable, net of allowance of $43 and $56, respectively	4,660	6,040
Notes receivable, net of allowance of $4 and $4, respectively	203	200
Inventories	15,668	11,740
Prepaid and other current assets	1,474	1,062
Total current assets	29,975	33,716
Property and equipment, net	520	563
Equipment under lease, net	6,248	6,316
Notes and other receivables, long-term, net of allowance of $16 and $9, respectively	768	442
Intangible assets, net	11,845	12,122
Other assets	2,605	2,685
Total assets	51,961	55,844
Current liabilities:
Accounts payable	4,923	5,422
Accrued liabilities	3,493	4,700
Deferred revenue	1,032	768
Operating lease liabilities	544	531
Total current liabilities	9,992	11,421
Long-term operating lease liabilities	2,171	2,272
Other long-term liabilities	360	167
Total liabilities	12,523	13,860
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 10,000 shares authorized at March 31, 2023 and December 31, 2022; no shares issued and outstanding at March 31, 2023 and December 31, 2022
Common stock, par value $0.01 per share, 150,000 shares authorized at March 31, 2023 and December 31, 2022; 11,103 and 11,093 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	111	111
Additional paid-in capital	141,107	139,381
Accumulated deficit	(101,780)	(97,508)
Total stockholders’ equity	39,438	41,984
Total liabilities and stockholders’ equity	$ 51,961	$ 55,844