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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 8,425 $ 12,587
Cost of sales 5,280 7,436
Gross profit 3,145 5,151
Operating expenses:    
Product development 804 542
Selling, general, and administrative 4,310 3,340
Total operating expenses 5,114 3,882
(Loss) income from operations (1,969) 1,269
Other expenses (income):    
Interest expense 0 23
Other (income) expenses (3) 22
(Loss) income from continuing operations before income taxes (1,966) 1,224
Provision for income taxes 11 0
(Loss) income from continuing operations (1,977) 1,224
Discontinued operations:    
Loss from discontinued operations 0 (69)
Loss on disposal of discontinued operations (12) (36)
Loss from discontinued operations before income taxes (12) (105)
Provision for (benefit from) income taxes 0 (10)
Loss from discontinued operations (12) (95)
Net (loss) income $ (1,989) $ 1,129
Net (loss) income per share - basic:    
From continuing operations (in dollars per share) $ (0.17) $ 0.13
From discontinued operations (in dollars per share) 0.00 (0.01)
Net income (loss) per share - basic (in dollars per share) (0.17) 0.12
Net (loss) income per share - diluted:    
From continuing operations (in dollars per share) (0.17) 0.12
From discontinued operations (in dollars per share) 0.00 (0.01)
Net income (loss) per share - diluted (in dollars per share) $ (0.17) $ 0.11
Weighted average shares used in computing net (loss) income per share:    
Basic (in shares) 11,650 9,671
Diluted (in shares) 11,650 9,993