Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 171	$ 689
Accounts receivable, net	844	403
Inventory, net	1,184	917
Prepaid expenses and other current assets	135	174
Total current assets	2,334	2,183
Non-current inventory, net	372	371
Property and equipment, net	384	534
Intangible assets, net	949	1,262
Right-of-use assets	868	874
Deposits and other assets	39	63
Total assets	4,946	5,287
Current liabilities:
Accounts payable	508	360
Accrued liabilities	404	386
Operating lease liabilities, current	179	346
Advances	250	250
Related party note payable	2,943
Paycheck Protection Program loan, current		141
Total current liabilities	4,284	1,483
Related party note payable		2,475
Paycheck Protection Program loan, net of current portion		517
Operating lease liabilities, net of current portion	950	845
Total liabilities	5,234	5,320
Commitments and contingencies (Note 11)
Stockholders' Deficit:
Common stock, $0.001 par value; 120,000,000 shares authorized; 8,004,389 and 7,539,089 shares issued and outstanding at December 30, 2021 and 2020, respectively	8	8
Additional paid-in capital	105,413	104,769
Accumulated deficit	(110,014)	(109,115)
Total stockholders' deficit	(4,588)	(4,333)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	4,946	5,287
Series D Redeemable Convertible Preferred Stock [Member]
Current liabilities:
Series D redeemable convertible preferred stock, $0.001 par value; 50 shares authorized; 43 shares issued and outstanding; liquidation preference of $4,300 at December 31, 2021 and 2020	4,300	4,300
Nonredeemable Convertible Preferred Stock [Member]
Stockholders' Deficit:
Non-redeemable convertible preferred stock, $0.001 par value; 10,004,310 and 10,006,310 shares authorized, 5,254,310 and 5,255,124 shares issued and outstanding, liquidation preference of $9,766 and $10,565 at December 31, 2021 and December 31, 2020, respectively	$ 5	$ 5