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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Net sales $ 18,335 $ 7,304 $ 47,154 $ 13,856
Cost of sales 9,205 4,809 25,433 9,268
Gross profit 9,130 2,495 21,721 4,588
Operating expenses:        
Product development 738 231 1,935 622
Selling, general, and administrative 4,651 1,946 11,620 5,045
Total operating expenses 5,389 2,177 13,555 5,667
Operating income (loss) 3,741 318 8,166 (1,079)
Other expenses (income):        
Interest expense 22 23 71 2,669
Other (income) expenses (28) 39 9 433
Income (loss) from continuing operations before income taxes 3,747 256 8,086 (4,181)
(Benefit from) provision for income taxes (651) 0 272 0
Income (loss) from continuing operations 4,398 256 7,814 (4,181)
Discontinued operations:        
Loss from discontinued operations (53) (659) (167) (916)
Loss on disposal of discontinued operations (89) 0 (161) 0
Loss from discontinued operations before income taxes (142) (659) (328) (916)
Benefit from income taxes 0 0 (10) (2)
Loss from discontinued operations (142) (659) (318) (914)
Net income (loss) $ 4,256 $ (403) $ 7,496 $ (5,095)
Net income (loss) per share - basic:        
From continuing operations (in dollars per share) $ 0.42 $ 0.03 $ 0.78 $ (0.57)
From discontinued operations (in dollars per share) (0.01) (0.08) (0.03) (0.13)
Net income (loss) per share - basic (in dollars per share) 0.41 (0.05) 0.75 (0.70)
Net income (loss) per share - diluted:        
From continuing operations (in dollars per share) 0.41 0.03 0.75 (0.57)
From discontinued operations (in dollars per share) (0.01) (0.08) (0.03) (0.13)
Net income (loss) per share - diluted (in dollars per share) $ 0.40 $ (0.05) $ 0.72 $ (0.70)
Weighted average shares used in computing net income (loss) per share:        
Basic (in shares) 10,310 8,781 10,002 7,276
Diluted (in shares) 10,665 8,781 10,342 7,276