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CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - 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]        
Product sales, net $ 5,128 $ 5,396 $ 9,972 $ 13,666
Cost of goods sold 2,838 3,074 5,324 7,336
Gross Profit 2,290 2,322 4,648 6,330
Operating expenses:        
Research and development 225 746 411 2,255
Selling, general and administrative 5,575 6,233 10,860 14,052
Total operating expenses 5,800 6,979 11,271 16,307
Operating Loss (3,510) (4,657) (6,623) (9,977)
Other Expenses [Abstract]        
Interest (income) expense, net 9 4 23 (6)
Loss before income taxes (3,519) (4,661) (6,646) (9,971)
Income tax expense (benefit) 11 20 11 (138)
Net Loss $ (3,530) $ (4,681) $ (6,657) $ (9,833)
Weighted average common shares outstanding, basic and diluted (shares) 107,623 99,863 106,074 99,771
Net loss per common share, basic and diluted (in USD per share) $ (0.03) $ (0.05) $ (0.06) $ (0.10)
Revenue, Product and Service [Extensible List]     us-gaap:ProductMember  

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