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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (720,642) $ 102,312
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,098 13,891
Stock-based compensation 42,513 40,592
Other, net 145 104
Unrealized loss (gain) on long term investments 48,132 (20,989)
Change in fair value of acquisition-related contingent consideration 6,627 6,671
Changes in operating assets and liabilities:    
Accounts receivable (42,713) 63,517
Prepaid expenses and other assets (16,701) 5,559
Inventory (5,712) (600)
Accounts payable (22,710) (33,464)
Accrued and other liabilities 14,546 (21,930)
Net cash (used in) provided by operating activities (683,417) 155,663
Cash flows from investing activities:    
Purchase of long term investments (95,468)  
Capital expenditures (39,265) (18,267)
Purchases of marketable securities (147,403) (34,574)
Sale and maturities of marketable securities 173,576 28,278
Net cash used in investing activities (108,560) (24,563)
Cash flows from financing activities:    
Proceeds from issuance of common stock under stock plans 14,619 15,481
Payment of finance lease liabilities (187) (195)
Payment of contingent consideration (11,933) (10,799)
Net cash provided by financing activities 2,499 4,487
Effect of exchange rates on cash, cash equivalents, restricted cash and investments 1,560 126
Net (decrease) increase in cash, cash equivalents, restricted cash and investments (787,918) 135,713
Cash, cash equivalents, restricted cash and investments at beginning of period 1,833,707 1,164,986
Cash, cash equivalents, restricted cash and investments at end of period 1,045,789 1,300,699
Supplemental Schedule of Cash Flow Information    
Income taxes paid 855 448
Unpaid purchases of property and equipment 13,582 8,414
Leased assets obtained in exchange for new operating lease liabilities $ 1,984 932
Leased assets obtained in exchange for new finance lease liabilities   $ 645