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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Cash flows from operating activities    
Net income (loss) $ 2,759 $ 2,066
Income from discontinued operations, net of tax 0 7,785
Income (loss) from continuing operations 2,759 (5,719)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by operating activities:    
Stock-based compensation 6,586 4,765
Depreciation and amortization 1,701 3,070
Deferred taxes (1,593) 837
Foreign currency remeasurement gain 1,671 351
Other non-cash operating (income) expense 489 (120)
Changes in operating assets and liabilities, net of effects from acquisitions:    
Accounts receivable (1,290) (486)
Unbilled accounts receivable 83 (635)
Prepaid expenses and other current assets (1,362) (1,015)
Other non-current assets 444 0
Accounts payable (181) (208)
Accrued expenses and other current liabilities 7,313 2,161
Deferred revenue 3,492 3,516
Other non-current liabilities 1,166 1,040
Net cash provided by operating activities by continuing operations 21,278 7,557
Net cash provided by operating activities by discontinued operations 0 2,441
Net cash provided by operating activities 21,278 9,998
Cash flows from investing activities    
Purchases of property and equipment (566) (152)
Payments for acquisitions, net of cash acquired 0 (420)
Purchase of short-term investment (15,000) (15,000)
Sale of short-term investment 15,000 0
Payments for security deposits (33) 0
Net cash used in investing activities (599) (15,572)
Cash flows from financing activities    
Proceeds from issuance of Series A Redeemable Convertible Preferred Stock, net of issuance costs of $2,124 0 44,226
Proceeds from exercise of common stock options 2,600 1,113
Payment for repurchase of common stock 0 (30,525)
Net cash provided by financing activities by continuing operations 2,600 14,814
Net cash used in financing activities by discontinued operations 0 (14,510)
Net cash provided by financing activities 2,600 304
Effect of exchange rate changes on cash and cash equivalents (2,939) (137)
Net increase (decrease) in cash and cash equivalents 20,340 (5,407)
Cash and cash equivalents, beginning of the period 61,094 61,240
Cash and cash equivalents, end of the period 81,434 55,833
Supplemental disclosure of cash flow activities    
Cash paid for taxes 101 177
Supplemental disclosure of non-cash operating, investing and financing activities    
Unpaid purchases of property and equipment 62 11
Series A Redeemable Convertible Preferred Stock dividend accretion 1,942 616
Fair value of common shares received from legal settlement (Note 3) $ 0 $ 2,593