Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 381	$ 1,836
Trade accounts receivable, less allowances of $18 and $8, respectively	1,628	2,021
Inventories, net	7,755	5,641
Short-term deposits	913	796
Prepaid and other current assets	1,421	782
Total current assets	12,098	11,076
Property and equipment, net	588	420
Operating lease right-of-use assets	419	794
Restructured lease right-of-use assets	0	107
Total assets	13,105	12,397
Current liabilities:
Accounts payable	2,606	2,477
Accrued liabilities	233	45
Accrued legal and professional fees	17	149
Accrued payroll and related benefits	691	885
Accrued sales commissions	40	95
Accrued restructuring	0	11
Accrued warranty reserve	240	227
Deferred revenue	2	72
Operating lease liabilities	475	598
Restructured lease liabilities	0	168
Finance lease liabilities	1	3
Streeterville note, net of discount and loan origination fees	1,602	0
PPP loan	0	529
Credit line borrowings, net of loan origination fees	2,666	2,298
Total current liabilities	8,573	7,557
Operating lease liabilities, net of current portion	30	318
Finance lease liabilities, net of current portion	0	1
PPP loan, net of current maturities	0	266
Total liabilities	8,603	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	140,615	135,113
Accumulated other comprehensive loss	(3)	(3)
Accumulated deficit	(136,110)	(130,855)
Total stockholders' equity	4,502	4,255
Total liabilities and stockholders' equity	$ 13,105	$ 12,397