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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net sales $ 5,002 $ 8,261 $ 15,119 $ 23,812
Cost of sales 3,865 5,179 11,920 15,063
Gross profit 1,137 3,082 3,199 8,749
Operating expenses:        
Product development 732 809 2,266 2,467
Selling, general, and administrative 2,393 5,423 8,802 15,323
Restructuring (200) 0 1,534 0
Total operating expenses 2,925 6,232 12,602 17,790
Loss from operations (1,788) (3,150) (9,403) (9,041)
Other expenses (income):        
Interest Expense 1 0 1 0
Other (income) expense (16) 16 5 7
Loss from continuing operations before income taxes (1,773) (3,166) (9,409) (9,048)
Provision for income taxes 0 11 0 22
Loss from continuing operations (1,773) (3,177) (9,409) (9,070)
Discontinued operations:        
Loss on disposal of discontinued operations 0 0 0 (12)
Loss from discontinued operations 0 0 0 (12)
Net loss $ (1,773) $ (3,177) $ (9,409) $ (9,082)
Net loss per share - basic:        
From continuing operations (in dollars per share) $ (0.15) $ (0.27) $ (0.80) $ (0.78)
From discontinued operations (in dollars per share) 0.00 0.00 0.00 0.00
Net loss per share - basic (in dollars per share) (0.15) (0.27) (0.80) (0.78)
Net loss per share - diluted:        
From continuing operations (in dollars per share) (0.15) (0.27) (0.80) (0.78)
From discontinued operations (in dollars per share) 0.00 0.00 0.00 0.00
Net loss per share - diluted (in dollars per share) $ (0.15) $ (0.27) $ (0.80) $ (0.78)
Weighted average shares used in computing net loss per share:        
Basic (in shares) 11,856 11,690 11,789 11,666
Diluted (in shares) 11,856 11,690 11,789 11,666