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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at beginning of period (in shares) at Jan. 01, 2016   227,960,943      
Balance at beginning of period at Jan. 01, 2016 $ (140,806) $ 228 $ 1,772,123 $ (232) $ (1,912,925)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (70,222)       (70,222)
Other comprehensive income (loss) (184) [1]     (184)  
Issuance of common stock in settlement of convertible notes (in shares)   54,009,279      
Issuance of common stock in settlement of convertible notes 253,080 $ 54 253,026    
Issuance of common stock under equity incentive and stock purchase plans (in shares)   7,953,576      
Issuance of common stock under equity incentive and stock purchase plans 24,538 $ 8 24,530    
Stock-based compensation 22,912   22,912    
Balance at end of period (in shares) at Dec. 30, 2016   289,923,798      
Balance at end of period at Dec. 30, 2016 89,318 $ 290 2,072,591 (416) (1,983,147)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 154,227       154,227
Other comprehensive income (loss) 69 [1]     69  
Issuance of common stock under equity incentive and stock purchase plans (in shares)   5,408,177      
Issuance of common stock under equity incentive and stock purchase plans 17,409 $ 5 17,404    
Issuance of common stock on warrant exercise (in shares)   877,451      
Issuance of common stock on exercise of warrants 0 $ 1 (1)    
Stock-based compensation $ 23,938   23,938    
Balance at end of period (in shares) at Dec. 29, 2017 296,209,426 296,209,426      
Balance at end of period at Dec. 29, 2017 $ 284,961 $ 296 2,114,184 (347) (1,829,172)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 690,070        
Net income | ASU 2016-02 (500)        
Other comprehensive income (loss) (354) [1]     (354)  
Issuance of common stock under equity incentive and stock purchase plans (in shares)   3,666,654      
Issuance of common stock under equity incentive and stock purchase plans 13,411 $ 4 13,407    
Stock-based compensation $ 40,626   40,626    
Balance at end of period (in shares) at Dec. 28, 2018 299,876,080 299,876,080      
Balance at end of period at Dec. 28, 2018 $ 1,287,453 $ 300 $ 2,168,217 $ (701) $ (880,363)
[1] Other comprehensive income (loss) consisted solely of unrealized gains or losses, net, on available-for-sale securities arising during the periods presented. There were nominal or no reclassification adjustments to net income (loss) resulting from realized gains or losses on the sale of securities. During the year ended December 31, 2018, there was a tax benefit of $0.2 million related to other comprehensive income as a result of the release of our valuation allowance for our deferred tax assets; there was no income tax benefit or provision related to other comprehensive income (loss) during the remaining periods presented.