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EMPLOYEE STOCK PLANS - Schedule of Restricted Stock Units (Details) - 6 months ended Jun. 28, 2015 - Restricted stock units - $ / shares
shares in Thousands
Total
Number of Shares  
Outstanding beginning balance 877
Granted (in shares) 921
Released (in shares) (293)
Forfeited (in shares) (57)
Outstanding ending balance 1,448
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Outstanding beginning balance (usd per share) $ 2.06
Weighted Average Grant Date Fair Value, Granted (in usd per share) 3.37
Weighted Average Grant Date Fair Value, Released (in usd per share) 2.33
Weighted Average Grant Date Fair Value, Forfeited (in usd per share) 2.78
Weighted Average Grant Date Fair Value, Outstanding ending balance (in usd per share) $ 2.81