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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Cash flows from operating activities    
Net income (loss) $ 2,497 $ 3,336
Income from discontinued operations, net of tax 0 7,834
Income (loss) from continuing operations 2,497 (4,498)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:    
Stock-based compensation 3,551 3,014
Depreciation and amortization 1,199 2,314
Deferred taxes 196 538
Foreign currency remeasurement gain 1,157 200
Other non-cash operating income 0 (78)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (1,448) (68)
Unbilled accounts receivable (191) (449)
Prepaid expenses and other current assets (1,358) (508)
Other non-current assets 0 (14)
Accounts payable 879 514
Accrued expenses and other current liabilities 1,258 3,014
Deferred revenue 3,469 1,452
Other non-current liabilities (69) 610
Net cash provided by operating activities by continuing operations 11,140 6,041
Net cash provided by operating activities by discontinued operations 0 2,481
Net cash provided by operating activities 11,140 8,522
Cash flows from investing activities    
Purchases of property and equipment (387) (84)
Payments for acquisitions, net of cash acquired 0 (420)
Purchase of short-term investment (15,000) 0
Sale of short-term investment 15,000 0
Net cash used in investing activities (387) (504)
Cash flows from financing activities    
Proceeds from exercise of common stock options 2,037 925
Net cash provided by financing activities by continuing operations 2,037 925
Net cash used in financing activities by discontinued operations 0 (14,510)
Net cash provided by (used in) financing activities 2,037 (13,585)
Effect of exchange rate changes on cash and cash equivalents (2,045) (56)
Net increase (decrease) in cash and cash equivalents 10,745 (5,623)
Cash and cash equivalents, beginning of the period 61,094 61,240
Cash and cash equivalents, end of the period 71,839 55,617
Supplemental disclosure of cash flow activities    
Cash paid for taxes 0 177
Supplemental disclosure of non-cash operating, investing and financing activities    
Unpaid purchases of property and equipment 15 17
Series A Redeemable Convertible Preferred Stock dividend accretion 1,262 0
Fair value of common shares received from legal settlement (Note 3) $ 0 $ 2,593