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Share-Based Compensation - Summary of Equity Awards Authorized and Available for Future Grant (Details) - 2015 Plan
6 Months Ended
Jul. 01, 2017
shares
Available for future grants  
Available for future grants at December 31, 2016 2,164,297
Newly authorized options 0
Granted (722,763)
Cancellation and forfeitures 0
Plan termination 0
Available for future grants at July 1, 2017 1,441,534