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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Cash flows from operating activities:    
Net income $ 7,523 $ 10,014
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 1,416 1,597
Amortization expense 523 410
Provision for doubtful accounts 478 488
Non-cash stock compensation expense 4,702 4,069
Changes in assets and liabilities:    
Increase in accounts receivable and unbilled revenue (1,252) (1,761)
Decrease in prepaid expenses and other assets 1,792 2,003
Decrease in accounts payable (2,858) (2,279)
Decrease in accrued expenses and other liabilities (3,293) (3,408)
Net cash provided by operating activities 9,031 11,133
Cash flows from investing activities:    
Purchases of property and equipment (1,619) (2,564)
Decrease in restricted cash 161 202
Net cash used in investing activities (1,458) (2,362)
Cash flows from financing activities:    
Debt proceeds   40,000
Repayment of borrowings (9,974) (12,000)
Debt issuance costs   (482)
Proceeds from issuance of common stock 924 751
Repurchases of common stock (594) (55,587)
Net cash used in financing activities (9,644) (27,318)
Effect of exchange rate on cash 16 145
Net decrease in cash and cash equivalents (2,055) (18,402)
Cash and cash equivalents at beginning of year 16,906 32,936
Cash and cash equivalents at end of period 14,851 14,534
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 451 123
Cash paid for interest $ 262 $ 407