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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Cash flows from operating activities:    
Net income $ 12,624 $ 9,828
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 1,251 1,258
Amortization expense 918 550
Amortization of debt issuance costs 45 61
Non-cash stock compensation expense 4,817 4,224
Provision (reversal) for doubtful accounts 224 (57)
Loss (gain) on foreign currency translation 399 (585)
Release of valuation allowance 2,036 3,148
Changes in assets and liabilities:    
Decrease (increase) in accounts receivable and unbilled revenue 62 (4,920)
Increase in prepaid expenses and other assets (1,412) (424)
Decrease in accounts payable (1,327) (2,010)
Decrease in accrued expenses and other liabilities (6,821) (3,374)
Increase (decrease) in income tax payable (3,830) 80
Net cash provided by operating activities 8,986 7,779
Cash flows from investing activities:    
Purchases of property and equipment (2,946) (1,259)
Cash consideration paid for acquisitions (9,268)  
Cash acquired in acquisitions 261  
Net cash used in investing activities (11,953) (1,259)
Cash flows from financing activities:    
Proceeds from ESPP 562 519
Proceeds from borrowings 19,000 30,000
Repayment of borrowings (6,000) (8,000)
Debt issuance costs   (237)
Dividends paid (4,023) (3,199)
Exercise of stock options 200  
Repurchase of common stock (12,060) (33,476)
Net cash used in financing activities (2,321) (14,393)
Effect of exchange rate on cash (3) (12)
Net decrease in cash and cash equivalents (5,291) (7,885)
Cash at beginning of period 19,710 23,503
Cash at end of period 14,419 15,618
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 3,735 2,546
Cash paid for interest 163 $ 65
Supplemental disclosure of non-cash acquisition financing activities:    
Shares issued to sellers of Jibe Consulting $ 3,600,000