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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating Activities    
Net income (loss) $ 22,936 $ (707)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 37,490 38,542
Loss on disposal of fixed assets 136 128
Share-based compensation expense 20,851 16,315
Income tax benefits from employee stock plans 0 11
Deferred income taxes (8,849) (9,182)
Amortization of debt financing fees 1,718 1,192
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable and unbilled receivables (16,179) (22,735)
Inventories (5,288) (22,942)
Prepaid expenses 774 (972)
Other current assets 3,120 (5,133)
Investment in sales-type leases (1,732) 6,643
Prepaid commissions 991 217
Other long-term assets (6,188) (750)
Accounts payable (8,439) 23,717
Accrued compensation 5,712 658
Accrued liabilities 1,482 4,021
Deferred revenues 9,014 (9,240)
Other long-term liabilities (1,035) 865
Net cash provided by operating activities 56,514 20,648
Investing Activities    
Purchases of intangible assets, intellectual property, and patents 0 (160)
Software development for external use (22,213) (10,121)
Purchases of property and equipment (19,259) (9,374)
Business acquisitions, net of cash acquired 0 (4,446)
Net cash used in investing activities (41,472) (24,101)
Financing Activities    
Proceeds from debt 0 37,000
Repayment of debt and revolving credit facility (27,000) (100,000)
Payment for contingent consideration 0 (2,400)
Proceeds from stock issuances under stock-based compensation plans 27,729 26,468
Employees’ taxes paid related to restricted stock units (3,648) (3,133)
Net cash used in financing activities (2,919) (42,065)
Effect of exchange rate changes on cash and cash equivalents (373) (1,504)
Net increase (decrease) in cash and cash equivalents 11,750 (47,022)
Cash and cash equivalents at beginning of period 32,424 54,488
Cash and cash equivalents at end of period 44,174 7,466
Supplemental disclosure of non-cash activities    
Unpaid purchases of property and equipment 388 886
Inventory transferred to property and equipment 2,194 0
Effect of adoption of ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718)” $ 0 $ 1,582