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Stockholders' Equity, Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
May. 27, 2015
Apr. 21, 2015
Jun. 04, 2014
May. 16, 2014
Jun. 30, 2015
Dec. 31, 2014
Restricted Stock Units ("RSUs") [Member]            
Restricted stock units, number of shares [Roll Forward]            
Outstanding RSUs, beginning of period (in shares)         1,463,834  
Awarded (in shares)         835,875  
Released (in shares)         (295,352)  
Forfeited (in shares)         (156,408)  
Outstanding RSUs, end of period (in shares)         1,847,949 1,463,834
Restricted stock units, weighted average grant-date fair value [Roll forward]            
Outstanding RSUs, beginning of period (in dollars per share)         $ 3.51  
Awarded (in dollars per share)         1.66  
Released (in dollars per share)         2.52  
Forfeited (in dollars per share)         3.25  
Outstanding RSUs, end of period (in dollars per share)         $ 2.85 $ 3.51
Restricted stock units, additional disclosures [Abstract]            
Outstanding RSUs, weighted average remaining contractual term         1 year 6 months 14 days 1 year 6 months 22 days
Outstanding RSUs, aggregate intrinsic value         $ 2,606 $ 3,067
Compensation cost not yet recognized [Abstract]            
Unrecognized compensation cost related to restricted stock units         $ 3,700  
Weighted average period of recognition for unrecognized compensation cost         2 years 6 months  
May 27, 2015 Award [Member] | Time-based RSUs [Member] | Non-employee Directors [Member]            
Restricted stock units, number of shares [Roll Forward]            
Awarded (in shares) 173,610          
Restricted stock units, additional disclosures [Abstract]            
Vesting period         1 year  
April 21, 2015 Award [Member] | Time-based RSUs [Member] | Corporate Employees [Member]            
Restricted stock units, number of shares [Roll Forward]            
Awarded (in shares)   397,000        
Restricted stock units, additional disclosures [Abstract]            
Vesting period         3 years  
June 4, 2014 Award [Member] | Time-based RSUs [Member] | Non-employee Directors [Member]            
Restricted stock units, number of shares [Roll Forward]            
Awarded (in shares)     108,225      
Restricted stock units, additional disclosures [Abstract]            
Vesting period         1 year  
May 16, 2014 Award [Member] | Time-based RSUs [Member] | President and Chief Executive Officer [Member]            
Restricted stock units, number of shares [Roll Forward]            
Awarded (in shares)       218,752    
Restricted stock units, additional disclosures [Abstract]            
Vesting period         4 years  
Percentage of the awards annual vesting tranches (in hundredths)       25.00%