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v3.8.0.1

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 30, 2018 | Mar. 31, 2017
Statement of Cash Flows [Abstract] |  |
Net income | $ 115,857 | $ 16,700
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation and amortization | 371 | 281
Stock-based compensation expense | 9,305 | 4,713
Amortization of debt discounts and debt issuance costs | 0 | 89
Interest paid in kind | 0 | 2,068
Gain on other equity investments | (209) | 0
Other | 1,722 | 680
Changes in assets and liabilities: |  |
Trade and other receivables | (10,755) | 6,541
Inventory, net | (906) | 34
Unbilled collaboration revenue | (38,014) | 0
Prepaid expenses and other current assets | 1,900 | (881)
Other long-term assets | (346) | (19)
Accounts payable | (183) | (1,916)
Accrued compensation and benefits | (317) | (5,844)
Accrued clinical trial liabilities | (4,498) | 347
Accrued collaboration liabilities | (1,000) | 0
Deferred revenue | (2,652) | 35,139
Other current and long-term liabilities | 1,533 | 10,926
Net cash provided by operating activities | 71,808 | 68,858
Cash flows from investing activities: |  |
Purchases of property and equipment | (2,947) | (804)
Purchases of investments | (116,537) | (124,494)
Proceeds from maturities of investments | 87,504 | 122,507
Proceeds from sale of investments | 6,238 | 37,294
Proceeds from other equity investments | 209 | 0
Net cash provided by (used in) investing activities | (25,533) | 34,503
Cash flows from financing activities: |  |
Repayment of convertible notes and term loan payable | 0 | (80,000)
Proceeds from exercise of stock options | 1,875 | 9,675
Taxes paid related to net share settlement of equity awards | (2,129) | (1,543)
Net cash used in financing activities | (254) | (71,868)
Net increase in cash, cash equivalents and restricted cash | 46,021 | 31,493
Cash, cash equivalents and restricted cash at beginning of period | 188,314 | 155,836
Cash, cash equivalents and restricted cash at end of period | $ 234,335 | $ 187,329

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