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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
$0.001 Par Value Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2014 $ 38 $ 274,222 $ (6,320) $ (3,008) $ 288,269 $ 553,201
Balance (in shares) at Dec. 31, 2014 38,129,872   (420,189)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee equity plans activity $ 2 43,749   0 0 43,751
Employee equity plans activity (in shares) 1,699,536          
Treasury stock     $ (100) 0   (100)
Treasury stock (in shares)     (2,641)      
Net income         62,870 62,870
Foreign currency translation, net of tax       295 0 295
Balance at Dec. 31, 2015 $ 40 317,971 $ (6,420) (2,713) 351,139 660,017
Balance (in shares) at Dec. 31, 2015 39,829,408   (422,830)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee equity plans activity $ 1 34,464   0 0 34,465
Employee equity plans activity (in shares) 1,167,482          
Separation of Aptevo         (148,435) (148,435)
Treasury stock     $ 0 0   0
Treasury stock (in shares)     0      
Net income       0 51,776 51,776
Foreign currency translation, net of tax       (1,618) 0 (1,618)
Balance at Dec. 31, 2016 $ 41 352,435 $ (6,420) (4,331) 254,480 $ 596,205
Balance (in shares) at Dec. 31, 2016 40,996,890   (422,830)     40,574,060
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee equity plans activity $ 1 27,951   0 0 $ 27,952
Employee equity plans activity (in shares) 1,114,830          
Shares issued to extinguish convertible notes $ 8 238,030       $ 238,038
Shares issued to extinguish convertible notes (in shares) 8,508,088         8,508,088
Treasury stock     $ (33,077) 0   $ (33,077)
Treasury stock (in shares)     (791,613)     (800,000)
Net income       0 82,594 $ 82,594
Foreign currency translation, net of tax       633 0 633
Balance at Dec. 31, 2017 $ 50 $ 618,416 $ (39,497) $ (3,698) $ 337,074 $ 912,345
Balance (in shares) at Dec. 31, 2017 50,619,808   (1,214,443)     49,405,365