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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue        
Revenue $ 49,554 $ 45,694 $ 94,986 $ 87,658
Cost of goods sold        
Cost of goods sold 13,573 13,646 24,308 25,698
Gross profit 35,981 32,048 70,678 61,960
Operating costs        
Sales and marketing 16,622 15,339 30,899 29,043
Research and development 8,016 6,320 13,813 12,176
General and administrative 11,210 8,588 21,984 16,441
Amortization / impairment of intangible assets 2,744 2,201 4,945 4,399
Total operating costs 38,592 32,448 71,641 62,059
Operating loss (2,611) (400) (963) (99)
Interest income, net 340 340 733 630
Other income, net 1,399 373 1,779 588
Income (loss) before income taxes (872) 313 1,549 1,119
Provision for income taxes 130 203 759 436
Net income (loss) $ (1,002) $ 110 $ 790 $ 683
Net income (loss) per share        
Basic (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02
Diluted (in dollars per share) $ (0.03) $ 0.00 $ 0.02 $ 0.02
Weighted average common shares outstanding        
Basic (in shares) 39,908 39,797 39,902 39,783
Diluted (in shares) 39,908 39,842 40,015 39,843
Product and license        
Revenue        
Revenue $ 34,986 $ 34,472 $ 68,480 $ 66,032
Cost of goods sold        
Cost of goods sold 10,391 11,045 18,576 20,585
Service and other        
Revenue        
Revenue 14,568 11,222 26,506 21,626
Cost of goods sold        
Cost of goods sold $ 3,182 $ 2,601 $ 5,732 $ 5,113