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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Deficit [Member]
Balance at beginning of period (in shares) at Jan. 02, 2015   195,895,769      
Balance at beginning of period at Jan. 02, 2015 $ (159,324) $ 196 $ 1,591,782 $ (121) $ (1,751,181)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (161,744)       (161,744)
Other comprehensive (loss) income (111)     (111)  
Sale of shares of common stock, net (in shares)   28,750,000      
Sale of shares of common stock, net 145,649 $ 29 145,620    
Issuance of common stock under equity incentive and stock purchase plans (in shares)   3,315,174      
Issuance of common stock under equity incentive and stock purchase plans 11,277 $ 3 11,274    
Stock-based compensation 21,977   21,977    
Warrants transferred from other long-term liabilities 1,470   1,470    
Balance at end of period (in shares) at Jan. 01, 2016   227,960,943      
Balance at end 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 (loss) (70,222)       (70,222)
Other comprehensive (loss) income (184)     (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 289,923,798 289,923,798      
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]          
Adoption of Accounting Standards Update No. 2016-09 0   252   (252)
Net income (loss) 154,227       154,227
Other comprehensive (loss) income 69     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 warrant exercise 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)