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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Net sales $ 2,074 $ 3,335 $ 4,711 $ 7,118
Cost of sales 1,681 1,992 3,765 4,743
Gross profit 393 1,343 946 2,375
Operating expenses:        
Product development 370 313 1,023 595
Selling, general, and administrative 2,268 1,973 4,486 4,000
Restructuring (3) (14) (22) (28)
Total operating expenses 2,635 2,272 5,487 4,567
Loss from operations (2,242) (929) (4,541) (2,192)
Other expenses (income):        
Interest expense 216 87 343 220
Gain on forgiveness of PPP loan 0 0 (801) 0
Loss from change in fair value of warrants 0 3,300 0 2,427
Other expenses 15 24 32 42
Net loss $ (2,473) $ (4,340) $ (4,115) $ (4,881)
Net loss per common share - basic and diluted        
Net loss per common share - basic (USD per share) $ (0.59) $ (1.36) $ (1.05) $ (1.55)
Net loss per common share - diluted (USD per share) $ (0.59) $ (1.36) $ (1.05) $ (1.55)
Weighted average shares of common stock outstanding:        
Basic weighted average common shares outstanding (in shares) [1] 4,211 3,192 3,913 3,139
Diluted weighted average common shares outstanding (in shares) [1] 4,211 3,192 3,913 3,139
[1] * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.