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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Cash flows from operating activities:      
Net income $ 4,841 $ 10,030 $ 12,129
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,472 6,211 4,082
Deferred income taxes, net (209) (2,890) 621
(Gain) loss on sale/disposal of equipment (8) (12) 27
Provision for doubtful accounts 1,051 470 (189)
Stock-based compensation 12,112 6,262 2,774
Accretion and fair value adjustments of contingent consideration (302) (1,426) 1,156
Changes in operating assets and liabilities, net of effects from business acquisitions:      
Accounts receivable 11,627 3,177 (7,412)
Contract assets (34,598) (11,539) (5,744)
Other receivables (2,714) 4,081 (1,126)
Prepaid expenses and other current assets (343) (154) (1,096)
Other assets (6,520) (778) 25
Accounts payable (6,294) (1,583) 3,186
Accrued liabilities 16,761 (1,945) 4,329
Contract liabilities 315 (2,272) (1,593)
Right-of-use assets 430 (64) (100)
Net cash provided by operating activities 11,621 7,568 11,069
Cash flows from investing activities:      
Purchase of equipment and leasehold improvements (6,637) (2,105) (2,178)
Proceeds from sale of equipment 45 59  
Cash paid for acquisitions, net of cash acquired (71,756) (124,344) (14,603)
Net cash used in investing activities (78,348) (126,390) (16,781)
Cash flows from financing activities:      
Payments on contingent consideration (1,381) (4,296) (1,709)
Payments on notes payable (1,842) (477) (4,164)
Payments on debt issuance costs (709) (1,300)  
Proceeds from notes payable   1,805  
Borrowings under term loan facility and line of credit 138,000 70,000 1,000
Repayments under term loan facility and line of credit (78,000) (2,500)  
Principal payments on finance leases (639) (367) (390)
Proceeds from stock option exercise 931 668 1,901
Proceeds from sales of common stock under employee stock purchase plan 1,740 1,300 830
Proceeds from equity raise   55,266  
Shares used to pay taxes on stock grants (2,880) (442)  
Proceeds from unregistered sales of equity 1,700    
Net cash provided by (used in) financing activities 56,920 119,657 (2,532)
Net increase (decrease) in cash and cash equivalents (9,807) 835 (8,244)
Cash and cash equivalents at beginning of period 15,259 14,424 22,668
Cash and cash equivalents at end of period 5,452 15,259 14,424
Cash paid during the period for:      
Interest 4,169 494 111
Income taxes 4,052 3,163 2,750
Supplemental disclosures of noncash investing and financing activities:      
Issuance of common stock related to business acquisitions     3,100
Contingent consideration related to business acquisitions   943 5,400
Other working capital adjustment   63 113
Equipment acquired under finance leases $ 661 $ 462 $ 294