Accrued Expenses (Tables)

9 Months Ended

Sep. 26, 2020

Accrued Liabilities, Current [Abstract]

Schedule of accrued expenses

Accrued expenses consist of the following (in thousands):

​	September 26, 2020		December 28, 2019
Compensation and related expenses	$	92,200	$	99,993
Income taxes payable	488		430
Commissions due to non-employee experts	1,808		9,961
Other professional fees	2,116		2,077
Direct project accruals	3,622		3,201
Accrued leasehold improvements	441		2,166
Other	3,277		3,473
Total accrued expenses	$	103,952	$	121,301