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SUPPLEMENTAL FINANCIAL STATEMENT DATA - Equipment And Leasehold Improvements, Net (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | $ 27,334,000 | $ 19,783,000 |
Accumulated depreciation and amortization | (15,283,000) | (11,785,000) |
Total equipment and leasehold improvements, net | 12,051,000 | 7,998,000 |
Depreciation | 3,400,000 | 1,600,000 | $ 1,500,000
Furniture and fixtures |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | 4,614,000 | 3,551,000 |
Computer hardware and software |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | 14,789,000 | 10,874,000 |
Leasehold improvements |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | 2,410,000 | 1,419,000 |
Equipment under finance lease |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | 1,957,000 | 1,304,000 |
Accumulated depreciation and amortization | (509,000) |  |
Automobiles, trucks, and field equipment |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Equipment and leasehold improvements, gross | $ 3,564,000 | 2,635,000 |
Equipment under capital leases |  |  |
EQUIPMENT AND LEASEHOLD IMPROVEMENTS |  |  |
Accumulated depreciation and amortization |  | $ (374,000) | $ (380,000)

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