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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - 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 $ 30,548 $ 33,462 $ 51,812 $ 56,848
Operating expenses:        
Cost of product revenue 8,152 6,315 15,996 12,398
Research & development 4,733 4,449 9,895 8,679
Selling, general & administrative 6,417 4,972 22,507 10,039
Total operating expenses 19,302 15,736 48,398 31,116
Income from operations 11,246 17,726 3,414 25,732
Interest and other income, net 290 16 385 74
Income before income taxes 11,536 17,742 3,799 25,806
Provision for income taxes 1,444 6,373 394 8,944
Net income $ 10,092 $ 11,369 $ 3,405 $ 16,862
Basic net income per share:        
Net income (in dollars per share) $ 0.69 $ 0.78 $ 0.23 $ 1.16
Basic weighted average common shares outstanding (in shares) 14,652 14,588 14,666 14,582
Diluted net income per share:        
Net income (in dollars per share) $ 0.68 $ 0.76 $ 0.23 $ 1.12
Diluted weighted average common shares outstanding (in shares) 14,915 15,044 15,045 15,046
Net income $ 10,092 $ 11,369 $ 3,405 $ 16,862
Foreign currency translation adjustment (951) 1,289 (331) 1,581
Comprehensive income 9,141 12,658 3,074 18,443
Product [Member]        
Revenue 30,542 28,340 51,800 51,721
Service [Member]        
Revenue $ 6 $ 5,122 $ 12 $ 5,127