BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 20,621	$ 14,674
Short-term investments	3,443
Accounts receivable, net of allowance of $62 and $56, respectively	4,001	6,040
Notes receivable, net of allowance of $7 and $4, respectively	323	200
Inventories	15,689	11,740
Prepaid and other current assets	2,367	1,062
Total current assets	46,444	33,716
Property and equipment, net	679	563
Equipment under lease, net	7,459	6,316
Long-term investments	492
Notes and other receivables, long-term, net of allowance of $26 and $9, respectively	1,279	442
Intangible assets, net	11,025	12,122
Other assets	2,207	2,685
Total assets	69,585	55,844
Current liabilities:
Accounts payable	4,007	5,422
Accrued liabilities	5,717	4,700
Deferred revenue	1,349	768
Operating lease liabilities	559	531
Total current liabilities	11,632	11,421
Long-term operating lease liabilities	1,750	2,272
Warrant liabilities	8,457
Other long-term liabilities	570	167
Total liabilities	22,409	13,860
Commitments and contingencies (Note 10)
Stockholders’ equity:
Series A Redeemable Convertible Preferred Stock, par value $0.01 per share, 20 and no shares authorized at December 31, 2023 and 2022, respectively; 20 and no shares issued and outstanding at December 31, 2023 and 2022, respectively; aggregate liquidation preference of $20,000 and $0 at December 31, 2023 and 2022, respectively	13,747
Preferred stock, par value $0.01 per share, 9,980 and 10,000 shares authorized at December 31, 2023 and 2022; no shares issued and outstanding at December 31, 2023 and 2022
Common stock, par value $0.01 per share, 150,000 shares authorized at December 31, 2023 and 2022; 11,327 and 11,093 shares issued and outstanding at December 31, 2023 and 2022, respectively	113	111
Additional paid-in capital	145,203	139,381
Accumulated other comprehensive income	4
Accumulated deficit	(111,891)	(97,508)
Total stockholders’ equity	33,429	41,984
Total liabilities, redeemable convertible preferred stock, and stockholders' equity	$ 69,585	$ 55,844