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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue $ 6,683 $ 10,560 $ 20,943 $ 32,549
Cost of goods sold 3,703 4,051 10,614 13,293
Gross profit 2,980 6,509 10,329 19,256
Operating expenses:        
Sales and marketing 2,168 3,006 7,796 8,393
Research and product development 1,781 2,268 5,757 6,947
General and administrative 1,341 1,281 4,500 5,597
Impairment of intangibles 736 736
Impairment of goodwill 12,724 12,724
Total operating expenses 5,290 20,015 18,053 34,397
Operating loss (2,310) (13,506) (7,724) (15,141)
Other income, net 5 78 78 264
Loss before income taxes (2,305) (13,428) (7,646) (14,877)
Provision for (benefit from) income taxes 7,837 (4,152) 6,505 (4,313)
Net loss $ (10,142) $ (9,276) $ (14,151) $ (10,564)
Basic weighted average shares outstanding (in shares) 8,306,707 8,520,041 8,304,974 8,641,173
Diluted weighted average shares outstanding (in shares) 8,306,707 8,520,041 8,304,974 8,641,173
Basic loss per share (in dollars per share) $ (1.22) $ (1.09) $ (1.70) $ (1.22)
Diluted loss per share (in dollars per share) $ (1.22) $ (1.09) $ (1.70) $ (1.22)
Comprehensive loss:        
Net loss $ (10,142) $ (9,276) $ (14,151) $ (10,564)
Unrealized gain (loss) on available-for-sale securities, net of tax (22) 10 (93) 68
Change in foreign currency translation adjustment (13) 23 (51) 88
Comprehensive loss $ (10,177) $ (9,243) $ (14,295) $ (10,408)