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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
NET REVENUES:        
Total revenue $ 35,989 $ 45,885 $ 104,937 $ 131,497
COST OF PRODUCTS SOLD 14,343 17,340 40,193 52,590
Gross profit 21,646 28,545 64,744 78,907
OPERATING EXPENSES:        
Research and development 4,619 3,855 13,525 12,191
Sales and marketing 8,955 7,304 23,937 22,232
General and administrative 7,556 6,529 23,748 28,567
Change in the estimated fair value of acquisition-related contingent consideration (2,387)   (843)  
Gain on sale of business (10,149)   (10,149)  
Total operating expenses 8,594 17,688 50,218 62,990
Operating income 13,052 10,857 14,526 15,917
OTHER INCOME 1,195 510 2,243 1,658
Income before income taxes 14,247 11,367 16,769 17,575
INCOME TAX EXPENSE 1,169 3,271 2,551 7,477
NET INCOME $ 13,078 $ 8,096 $ 14,218 $ 10,098
EARNINGS PER SHARE:        
BASIC $ 0.21 $ 0.13 $ 0.23 $ 0.17
DILUTED $ 0.21 $ 0.13 $ 0.23 $ 0.16
SHARES USED IN COMPUTING EARNINGS PER SHARE:        
BASIC 61,726 61,208 61,656 61,059
DILUTED 62,143 62,606 62,172 62,539
Products and Services [Member]        
NET REVENUES:        
Total revenue $ 35,299 $ 43,450 $ 100,898 $ 120,586
Other Revenues [Member]        
NET REVENUES:        
Total revenue $ 690 $ 2,435 $ 4,039 $ 10,911