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Revenue Recognition (Tables)
9 Months Ended
Sep. 26, 2020
Revenue from Contract with Customer [Abstract]  
Revenue by contract type
   For the Three Months Ended  For the Nine Months Ended
   September 26, 2020  September 28, 2019  September 26, 2020  September 28, 2019
Fixed-price revenue  $10,863   $5,334   $28,785   $14,418 
Time-and-material revenue   4,866    8,640    24,086    25,340 
Total Revenue   15,729    13,974    52,871    39,758