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Property and Equipment, net (Tables)
 9 Months Ended
Sep. 28, 2019
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property and equipment, net, consists of the following:
 
September 28, 2019
 
December 29, 2018

Office furniture and equipment
$
2,877

 
$
2,328

Computer equipment
12,382

 
11,640

Survey and field equipment
6,388

 
5,526

Leasehold improvements
3,981

 
2,541

 
25,628

 
22,035

Accumulated depreciation
(13,279
)
 
(10,358
)
 
$
12,349

 
$
11,677