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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Net sales $ 1,480 $ 2,074 $ 3,541 $ 4,711
Cost of sales 1,371 1,681 3,458 3,765
Gross profit 109 393 83 946
Operating expenses:        
Product development 353 370 856 1,023
Selling, general, and administrative 1,964 2,268 4,091 4,486
Restructuring recovery 0 (3) 0 (22)
Total operating expenses 2,317 2,635 4,947 5,487
Loss from operations (2,208) (2,242) (4,864) (4,541)
Other expenses (income):        
Interest expense 260 216 444 343
Gain on forgiveness of Paycheck Protection Program loan 0 0 0 (801)
Other income 0 0 (30) 0
Other expenses 18 15 29 32
Net loss $ (2,486) $ (2,473) $ (5,307) $ (4,115)
Net loss per common share - basic and diluted        
Net loss, basic (USD per share) $ (0.35) $ (0.59) $ (0.78) $ (1.05)
Net loss, diluted (USD per share) $ (0.35) $ (0.59) $ (0.78) $ (1.05)
Weighted average shares of common stock outstanding:        
Basic weighted average common shares outstanding (in shares) 7,166 4,211 6,803 3,913
Diluted weighted average common shares outstanding (in shares) 7,166 4,211 6,803 3,913