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Stock-Based Compensation - RSU Activity (Details) - RSUs
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 28, 2018
USD ($)
$ / shares
shares
Shares  
RSUs outstanding at beginning of period (in shares) | shares 3,762,990
Awarded (in shares) | shares 2,411,245
Vested and released (in shares) | shares (374,992)
Forfeited (in shares) | shares (249,362)
RSUs outstanding at end of period (in shares) | shares 5,549,881
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 18.50
Vested and released (in dollars per share) | $ / shares 8.18
Forfeited (in dollars per share) | $ / shares 18.64
RSUs outstanding at end of period (in dollars per share) | $ / shares $ 18.69
Weighted Average Remaining Contractual Term  
RSUs outstanding at end of period 2 years 1 month 6 days
Aggregate Intrinsic Value  
RSUs outstanding at end of period | $ $ 98,344