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BALANCE SHEET DETAILS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Sep. 27, 2016
Aug. 22, 2016
Aug. 12, 2016
Aug. 09, 2016
Aug. 08, 2016
Sep. 30, 2016
Aug. 31, 2016
Apr. 01, 2017
Sep. 21, 2016
Jul. 02, 2016
Oct. 31, 2015
Feb. 19, 2015
Balance Sheet Components [Line Items]                        
Restricted cash and cash equivalents               $ 1,100        
Restricted cash, current               716   $ 715    
Assets under capital lease               3,900   $ 5,900    
Disposal/sale of fully depreciated property and equipment               13,000        
Expected amortization of intangible assets in fiscal year 2017               200        
Expected amortization of intangible assets in fiscal year 2018               $ 600        
Stated interest rate (percent)                     1.15%  
Stock issued in September (shares) 15,000,000                      
Common stock, par value (in usd per share)               $ 0.01 $ 0.01 $ 0.01    
Stock offering, price per share (in USD per share)                 $ 8.35      
Stock offering, underwriter option period 30 days                      
Proceeds from issuance of common stock, net $ 135,200         $ 135,200            
Other Current Assets [Member]                        
Balance Sheet Components [Line Items]                        
Restricted cash, current               $ 700        
Other non-current assets                        
Balance Sheet Components [Line Items]                        
Restricted cash, noncurrent               $ 400        
Common Stock                        
Balance Sheet Components [Line Items]                        
Shares issued in settlement of debt (shares)   756,213 21,852,477 20,564,101 12,051,282   34,659,972          
Stock issued in September (shares)           17,250,000            
Underwriter option                        
Balance Sheet Components [Line Items]                        
Stock issued in September (shares) 2,250,000                      
Convertible Notes | 6.00% Convertible Senior Notes due 2020                        
Balance Sheet Components [Line Items]                        
Stated interest rate (percent)             6.00%         6.00%