Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash	$ 225	$ 2,682
Trade accounts receivable, less allowances of $5 and $14, respectively	1,330	1,240
Inventories, net	7,367	7,866
Short-term deposits	701	712
Prepaid and other current assets	909	924
Total current assets	10,532	13,424
Property and equipment, net	631	675
Operating lease right-of-use assets	1,386	292
Total assets	12,549	14,391
Current liabilities:
Accounts payable	2,230	2,235
Accrued liabilities	317	265
Accrued legal and professional fees	69	104
Accrued payroll and related benefits	477	718
Accrued sales commissions	71	57
Accrued warranty reserve	265	295
Deferred revenue	0	268
Operating lease liabilities	237	325
Finance lease liabilities	0	1
Streeterville - 2021 note, net of discount and loan origination fees	1,161	1,719
Credit line borrowings, net of loan origination fees	3,109	2,169
Total current liabilities	7,936	8,156
Operating lease liabilities, net of current portion	1,181	26
Total liabilities	9,117	8,182
STOCKHOLDERS' EQUITY
Preferred stock, par value $0.0001 per share	0	0
Common stock, par value $0.0001 per share	0	0
Additional paid-in capital	144,997	144,953
Accumulated other comprehensive loss	(3)	(3)
Accumulated deficit	(141,562)	(138,741)
Total stockholders' equity	3,432	6,209
Total liabilities and stockholders' equity	$ 12,549	$ 14,391