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Stock-Based Compensation - RSU Activity (Details) - RSUs
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 29, 2018
USD ($)
$ / shares
shares
Shares  
RSUs outstanding at beginning of period (in shares) | shares 3,762,990
Awarded (in shares) | shares 300,670
Vested and released (in shares) | shares (341,572)
Forfeited (in shares) | shares (120,886)
RSUs outstanding at end of period (in shares) | shares 3,601,202
Weighted Average Grant Date Fair Value Per Share  
RSUs outstanding at beginning of period (in dollars per share) | $ / shares $ 17.76
Awarded (in dollars per share) | $ / shares 23.35
Vested and released (in dollars per share) | $ / shares 7.75
Forfeited (in dollars per share) | $ / shares 19.81
RSUs outstanding at end of period (in dollars per share) | $ / shares $ 19.11
Weighted Average Remaining Contractual Term  
RSUs outstanding at end of period 1 year 7 months 27 days
Aggregate Intrinsic Value  
RSUs outstanding at end of period | $ $ 77,498