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v3.19.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities |  |
Net loss | $ (310,407) | $ (385,785)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 23,319 | 21,553
Stock-based compensation | 162,556 | 133,258
Deferred income taxes | (266) | 236
Other | (1,917) | (3,392)
Change in operating assets and liabilities, net of effect of acquisitions: |  |
Accounts receivable, net of allowance | 71,870 | 48,697
Prepaid expenses and other current assets | 271 | (10,439)
Operating lease right-of-use asset | 9,812 | 0
Other assets | (368) | 4,204
Accounts payable | 3,090 | (37,069)
Accrued expenses and other current liabilities | (14,323) | (10,149)
Operating lease liabilities | (10,470) | 0
Other liabilities | 655 | 6,905
Net cash used in operating activities | (66,178) | (231,981)
Cash flows from investing activities |  |
Purchases of property and equipment | (11,814) | (36,315)
Sales of property and equipment | 29 | 0
Purchases of intangible assets | 0 | (60)
Non-marketable investments | (2,250) | 0
Purchases of marketable securities | (525,520) | (477,213)
Sales of marketable securities | 0 | 45,007
Maturities of marketable securities | 458,627 | 787,828
Net cash provided by (used in) investing activities | (80,928) | 319,247
Cash flows from financing activities |  |
Proceeds from the exercise of stock options | 5,596 | 45,809
Stock repurchases from employees for tax withholdings | 0 | (551)
Net cash provided by financing activities | 5,596 | 45,258
Change in cash, cash equivalents, and restricted cash | (141,510) | 132,524
Cash, cash equivalents, and restricted cash, beginning of period | 388,974 | 337,007
Cash, cash equivalents, and restricted cash, end of period | 247,464 | 469,531
Supplemental disclosures |  |
Cash paid for income taxes | $ 320 | $ 991

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