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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 29, 2018 | Jun. 30, 2017
Statement of Cash Flows [Abstract] |  |
Net income | $ 203,351 | $ 34,356
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation and amortization | 1,176 | 563
Stock-based compensation expense | 18,588 | 9,740
401(k) matching contributions made in common stock | 2,723 | 998
Loss on extinguishment of debt | 0 | 6,239
Amortization of debt discounts and debt issuance costs | 0 | 182
Interest paid in kind | 0 | (11,825)
Gain on other equity investments | (209) | (639)
Other | (490) | 148
Changes in assets and liabilities: |  |
Trade and other receivables | (85,969) | (2,581)
Inventory, net | (1,714) | (2,087)
Prepaid expenses and other current assets | (1,577) | 1,049
Other long-term assets | 3 | 519
Accounts payable | (1,535) | 472
Accrued compensation and benefits | 465 | (4,779)
Accrued clinical trial liabilities | (3,048) | 549
Accrued collaboration liabilities | (1,261) | 5,873
Deferred revenue | 5,910 | 28,159
Other current and long-term liabilities | 10,164 | 7,457
Net cash provided by operating activities | 146,577 | 74,393
Cash flows from investing activities: |  |
Purchases of property and equipment | (15,182) | (2,298)
Purchases of investments | (227,012) | (154,809)
Proceeds from maturities of investments | 139,948 | 200,893
Proceeds from sale of investments | 10,237 | 37,294
Proceeds from other equity investments | 209 | 639
Net cash provided by (used in) investing activities | (91,800) | 81,719
Cash flows from financing activities: |  |
Repayment of convertible notes and term loan payable | 0 | (185,788)
Proceeds from exercise of stock options | 6,550 | 12,980
Proceeds from employee stock purchase plan | 3,650 | 3,053
Taxes paid related to net share settlement of equity awards | (2,976) | (2,331)
Principal payments on financing lease obligation | (304) | 0
Net cash used in financing activities | 6,920 | (172,086)
Net increase (decrease) in cash, cash equivalents and restricted cash | 61,697 | (15,974)
Cash, cash equivalents and restricted cash at beginning of period | 188,314 | 155,836
Cash, cash equivalents and restricted cash at end of period | 250,011 | 139,862
Supplemental cash flow disclosure - non-cash investing and financing activity: |  |
Property and equipment deemed to have been acquired under build-to-suit lease | 6,864 | 14,530
Unpaid liabilities incurred to acquire Property and equipment | $ 13,972 | $ 531

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- Definition The cash inflow associated with the sale and maturity (principal being due) of other investments, prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The cash inflow associated with the amount received from the stock plan during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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