Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Details)	12 Months Ended
	Dec. 28, 2019
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Survey and field equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful lives	Lesser of the estimated useful lives or remaining term of the lease