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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue $ 30,418 $ 30,548 $ 55,141 $ 51,812
Operating expenses:        
Cost of product revenue 6,836 8,152 14,147 15,996
Research & development 4,165 4,733 8,423 9,895
Selling, general & administrative 7,502 6,417 15,174 22,507
Total operating expenses 18,503 19,302 37,744 48,398
Income from operations 11,915 11,246 17,397 3,414
Interest and other income, net 533 290 1,031 385
Income before income taxes 12,448 11,536 18,428 3,799
Provision for income taxes 3,013 1,444 4,486 394
Net income $ 9,435 $ 10,092 $ 13,942 $ 3,405
Basic net income per share:        
Net income (in dollars per share) $ 0.68 $ 0.69 $ 0.99 $ 0.23
Basic weighted average common shares outstanding (in shares) 13,916 14,652 14,054 14,666
Diluted net income per share:        
Net income (in dollars per share) $ 0.67 $ 0.68 $ 0.98 $ 0.23
Diluted weighted average common shares outstanding (in shares) 14,088 14,915 14,203 15,045
Net income $ 9,435 $ 10,092 $ 13,942 $ 3,405
Foreign currency translation adjustment 145 (951) (170) (331)
Comprehensive income 9,580 9,141 13,772 3,074
Product [Member]        
Revenue 30,413 30,542 55,130 51,800
Service [Member]        
Revenue $ 5 $ 6 $ 11 $ 12