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Stock-Based Compensation - RSU Activity (Details) - RSUs
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 28, 2019
USD ($)
$ / shares
shares
Shares  
RSUs outstanding at beginning of period (in shares) | shares 4,857,334
Awarded (in shares) | shares 272,660
Vested and released (in shares) | shares (366,489)
Forfeited (in shares) | shares (180,351)
RSUs outstanding at end of period (in shares) | shares 4,583,154
Weighted Average Grant Date Fair Value Per Share  
RSUs outstanding at beginning of period (in dollars per share) | $ / shares $ 18.42
Awarded (in dollars per share) | $ / shares 21.72
Vested and released (in dollars per share) | $ / shares 10.68
Forfeited (in dollars per share) | $ / shares 18.03
RSUs outstanding at end of period (in dollars per share) | $ / shares $ 19.26
Weighted Average Remaining Contractual Term  
RSUs outstanding at end of period 1 year 8 months 12 days
Aggregate Intrinsic Value  
RSUs outstanding at end of period | $ $ 97,942