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EMPLOYEE STOCK PLANS - Restricted Stock Units - (Details) (USD $)
9 Months Ended
Sep. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Time-based RSUs vesting percentage on each anniversary of the vesting commencement date 25.00%
Restricted stock units
 
Number of Shares  
Outstanding beginning balance 429,000
Granted (in shares) 697,000
Released (in shares) (184,000)
Canceled or forfeited (in shares) (8,000)
Outstanding ending balance 934,000
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Outstanding beginning balance (usd per share) $ 1.45
Weighted Average Grant Date Fair Value, Granted (in usd per share) $ 2.42
Weighted Average Grant Date Fair Value, Released (in usd per share) $ 1.85
Weighted Average Grant Date Fair Value, Expired (in usd per share) $ 2.49
Weighted Average Grant Date Fair Value, Outstanding ending balance (in usd per share) $ 2.08
Time-based Restricted Stock Units
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Common stock equivalent shares 1.75