Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 2,682	$ 1,836
Trade accounts receivable, less allowances of $14 and $8, respectively	1,240	2,021
Inventories, net	7,866	5,641
Short-term deposits	712	796
Prepaid and other current assets	924	782
Total current assets	13,424	11,076
Property and equipment, net	675	420
Operating lease, right-of-use asset	292	794
Restructured lease, right-of-use asset	0	107
Total assets	14,391	12,397
Current liabilities:
Accounts payable	2,235	2,477
Accrued liabilities	265	45
Accrued legal and professional fees	104	149
Accrued payroll and related benefits	718	885
Accrued sales commissions	57	95
Accrued restructuring	0	11
Accrued warranty reserve	295	227
Deferred revenue	268	72
Operating lease liabilities	325	598
Restructured lease liabilities	0	168
Finance lease liabilities	1	3
Streeterville note, net of discount and loan origination fees	1,719	0
PPP loan	0	529
Credit line borrowings, net of loan origination fees	2,169	2,298
Total current liabilities	8,156	7,557
Operating lease liabilities, net of current portion	26	318
Finance lease liabilities, net of current portion	0	1
PPP loan, net of current maturities	0	266
Total liabilities	8,182	8,142
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	144,953	135,113
Accumulated other comprehensive loss	(3)	(3)
Accumulated deficit	(138,741)	(130,855)
Total stockholders' equity	6,209	4,255
Total liabilities and stockholders' equity	$ 14,391	$ 12,397