CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jan. 01, 2021	Dec. 27, 2019
Cash flows from operating activities:
Net income (loss)	$ (8,417)	$ (14,496)	$ 4,841
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,146	18,743	15,472
Deferred income taxes, net	(2,738)	(5,209)	(209)
(Gain) loss on sale/disposal of equipment	(24)	(15)	(8)
Provision for doubtful accounts	102	1,330	1,051
Stock-based compensation	16,563	16,113	12,112
Accretion and fair value adjustments of contingent consideration	2,333	7,707	(302)
Changes in operating assets and liabilities, net of effects from business acquisitions:
Accounts receivable	(14,209)	3,070	11,627
Contract assets	3,138	35,498	(34,598)
Other receivables	138	(1,192)	(2,714)
Prepaid expenses and other current assets	828	577	(343)
Other assets	(7,849)	9,955	(6,520)
Accounts payable	(4,700)	7,372	(6,294)
Accrued liabilities	1,625	(34,509)	16,761
Contract liabilities	6,065	1,871	315
Right-of-use assets	(197)	210	430
Net cash provided by operating activities	9,804	47,025	11,621
Cash flows from investing activities:
Purchase of equipment and leasehold improvements	(8,500)	(5,076)	(6,637)
Proceeds from sale of equipment	46	17	45
Cash paid for acquisitions, net of cash acquired			(71,756)
Net cash used in investing activities	(8,454)	(5,059)	(78,348)
Cash flows from financing activities:
Payments on contingent consideration	(6,615)	(1,433)	(1,381)
Payments on notes payable	(1,909)	(205)	(1,842)
Payments on debt issuance costs		(327)	(709)
Proceeds from notes payable	2,074	1,140
Borrowings under term loan facility and line of credit		24,000	138,000
Repayments under term loan facility and line of credit	(13,000)	(42,000)	(78,000)
Principal payments on finance leases	(545)	(549)	(639)
Proceeds from stock option exercise	1,924	1,082	931
Proceeds from sales of common stock under employee stock purchase plan	2,655	2,224	1,740
Cash used to pay taxes on stock grants	(3,117)	(2,946)	(2,880)
Restricted Stock Award and Units	(1)	1
Proceeds from unregistered sales of equity			1,700
Net cash provided by (used in) financing activities	(18,534)	(19,013)	56,920
Net increase (decrease) in cash and cash equivalents	(17,184)	22,953	(9,807)
Cash and cash equivalents at beginning of period	28,405	5,452	15,259
Cash and cash equivalents at end of period	11,221	28,405	5,452
Cash paid (received) during the period for:
Interest	3,545	5,031	4,169
Income taxes	(1,616)	174	4,052
Supplemental disclosures of noncash investing and financing activities:
(Gain) loss on cash flow hedge valuations, net of tax	450	(92)	(396)
Other working capital adjustment		1,179
Equipment acquired under finance leases	$ 1,376	$ 467	$ 661