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Organization and Summary of Significant Accounting Policies - Impact of Adoption of Topic 606 and Topic 842 on the Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 225,397 $ 152,510 $ 625,224 $ 332,405
Selling, general and administrative expenses 48,120 38,129 153,989 113,084
Total operating expenses 100,221 71,330 297,971 203,926
Interest expense 1 0 1 8,679
Total other income, net 3,778 3,408 8,467 (8,820)
Income before income taxes 128,954 84,588 335,720 119,659
Provision for income taxes 2,324 3,206 5,739 3,921
Net income $ 126,630 $ 81,382 $ 329,981 $ 115,738
Net income per share, basic (in dollars per share) $ 0.42 $ 0.28 $ 1.11 $ 0.39
Net income per share, diluted (in dollars per share) $ 0.41 $ 0.26 $ 1.05 $ 0.37
ASU 2014-09 | Adjustments Due to the Adoption of Topic 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 32,558   $ 9,809  
Income before income taxes 32,558   9,809  
Provision for income taxes 680   566  
Net income $ 31,878   $ 9,243  
Net income per share, basic (in dollars per share) $ 0.11   $ 0.03  
Net income per share, diluted (in dollars per share) $ 0.10   $ 0.03  
ASU 2016-02        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Selling, general and administrative expenses $ 936   $ 936  
Total operating expenses 936   936  
Interest expense 348   348  
Total other income, net 348   348  
Income before income taxes (588)   (588)  
Provision for income taxes (2)   (2)  
Net income $ (586)   $ (586)  
Net income per share, basic (in dollars per share) $ 0.00   $ 0.00  
Net income per share, diluted (in dollars per share) $ 0.00   $ 0.00  
Balances Without the Adoption of Topic 606 or 842        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 192,839   $ 615,415  
Selling, general and administrative expenses 47,184   153,053  
Total operating expenses 99,285   297,035  
Interest expense (349)   (349)  
Total other income, net 3,430   8,119  
Income before income taxes 96,984   326,499  
Provision for income taxes 1,646   5,175  
Net income $ 95,338   $ 321,324  
Net income per share, basic (in dollars per share) $ 0.32   $ 1.08  
Net income per share, diluted (in dollars per share) $ 0.31   $ 1.03  
Collaboration Revenues        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 62,451 $ 56,094 $ 182,170 $ 79,108
Collaboration Revenues | Balances Without the Adoption of Topic 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues 29,893   172,361  
Collaboration Revenues | ASU 2014-09 | Adjustments Due to the Adoption of Topic 606        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues $ 32,558   $ 9,809