CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 24,920	$ 14,674
Accounts receivable, net of allowance of $36 and $56, respectively	3,848	6,040
Notes receivable, net of allowance of $5 and $4, respectively	264	200
Inventories	17,481	11,740
Prepaid and other current assets	2,132	1,062
Total current assets	48,645	33,716
Property and equipment, net	482	563
Equipment under lease, net	6,956	6,316
Notes and other receivables, long-term, net of allowance of $23 and $9, respectively	1,131	442
Intangible assets, net	11,298	12,122
Other assets	2,341	2,685
Total assets	70,853	55,844
Current liabilities:
Accounts payable	3,936	5,422
Accrued liabilities	5,457	4,700
Deferred revenue	1,064	768
Operating lease liabilities	554	531
Total current liabilities	11,011	11,421
Long-term operating lease liabilities	1,893	2,272
Warrant liabilities	7,259
Other long-term liabilities	560	167
Total liabilities	20,723	13,860
Commitments and contingencies (Note 9)
Series A Redeemable Convertible Preferred Stock, par value $0.01 per share, 20 and no shares authorized at September 30, 2023 and December 31, 2022, respectively; 20 and no shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively; aggregate liquidation preference of $20,000 and $0 at September 30, 2023 and December 31, 2022, respectively	13,747
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 9,980 and 10,000 shares authorized at September 30, 2023 and December 31, 2022, respectively; no shares issued and outstanding at September 30, 2023 and December 31, 2022
Common stock, par value $0.01 per share, 150,000 shares authorized at September 30, 2023 and December 31, 2022; 11,246 and 11,093 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	112	111
Additional paid-in capital	144,236	139,381
Accumulated deficit	(107,965)	(97,508)
Total stockholders’ equity	36,383	41,984
Total liabilities, convertible preferred stock, and stockholders' equity	$ 70,853	$ 55,844