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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue    
Revenue $ 45,432 $ 41,965
Total revenue 45,432 41,965
Cost of goods sold    
Cost of goods sold 8,185  
Total cost of goods sold 10,735 12,053
Gross profit 34,697 29,912
Operating costs:    
Sales and marketing 14,277 13,702
Research and development 5,797 5,856
General and administrative 10,774 7,853
Amortization of purchased intangible assets 2,201 2,199
Total operating costs 33,049 29,610
Operating income 1,648 302
Interest income, net 393 290
Other income, net 380 214
Income before income taxes 2,421 806
Provision for income taxes 629 233
Net income $ 1,792 $ 573
Net income per share    
Basic (in dollars per share) $ 0.04 $ 0.01
Diluted (in dollars per share) $ 0.04 $ 0.01
Weighted average common shares outstanding:    
Basic (in shares) 39,910 39,760
Diluted (in shares) 40,059 39,770
Product and license    
Revenue    
Revenue $ 33,494 $ 31,561
Cost of goods sold    
Cost of goods sold 8,185 9,540
Service and other    
Revenue    
Revenue 11,938 10,404
Cost of goods sold    
Cost of goods sold $ 2,550 $ 2,513