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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sales:        
Total sales, net $ 4,610 $ 3,662 $ 7,734 $ 6,935
Product cost of goods sold 2,304 1,824 3,492 3,283
Gross profit 2,306 1,838 4,242 3,652
Operating expenses:        
Research and development 27 40 53 68
Sales and marketing 1,718 2,040 3,371 4,025
General and administrative 1,916 1,910 3,907 4,093
Total operating expenses 3,661 3,990 7,331 8,186
Operating loss (1,355) (2,152) (3,089) (4,534)
Non-cash gain on changes in fair value of warrant liability 216 0 216 2,056
Non-cash gain on changes in fair value of combined derivative liability 40 0 40 0
Non-cash gain on changes in fair value of contingent liability 0 0 0 219
Other expense, net (937) (3) (942) (7)
Net loss (2,036) (2,155) (3,775) (2,266)
Less: Retained earnings reduction related to preferred stock down round feature triggered (1,996) 0 (1,996) 0
Net loss attributable to common stockholders $ (4,032) $ (2,155) $ (5,771) $ (2,266)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (1.27) $ (1.43) $ (2.21) $ (1.54)
Weighted-average shares of common stock outstanding used in computing net loss per share of common stock (basic and diluted) (in shares) 3,176 1,507 2,609 1,469
Product [Member]        
Sales:        
Total sales, net $ 4,599 $ 3,660 $ 7,716 $ 6,927
Product and Service, Other [Member]        
Sales:        
Total sales, net $ 11 $ 2 $ 18 $ 8