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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 28, 2019
Fair Value of Financial Instruments |
Summary of valuation of the financial instruments | The following summarizes the valuation of the Company’s financial instruments (in thousands). The tables do not include either cash on hand or assets and liabilities that are measured at historical cost or any basis other than fair value. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements | ​ | ​ | ​
​ | ​ | at September 28, 2019 Using | ​ | ​ | ​
​ |  | Quoted Prices in |  | Significant Other |  | Significant |  | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 128,072 | ​ | $ | — | ​ | $ | — | ​ | $ | 128,072
Corporate debt securities | ​ | ​ | — | ​ | ​ | 5,291 | ​ | ​ | — | ​ | ​ | 5,291
Total cash equivalents | ​ | $ | 128,072 | ​ | $ | 5,291 | ​ | $ | — | ​ | $ | 133,363
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities | ​ | $ | 80,686 | ​ | $ | 78,739 | ​ | $ | — | ​ | $ | 159,425
Corporate debt securities | ​ | ​ | — | ​ | ​ | 298,454 | ​ | ​ | — | ​ | ​ | 298,454
Total short-term investments | ​ | $ | 80,686 | ​ | $ | 377,193 | ​ | $ | — | ​ | $ | 457,879
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other assets, net: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Auction rate securities | ​ | $ | — | ​ | $ | — | ​ | $ | 5,715 | ​ | $ | 5,715
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 5,715 | ​ | $ | 5,715
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 208,758 | ​ | $ | 382,484 | ​ | $ | 5,715 | ​ | $ | 596,957
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements | ​ | ​ | ​
​ | ​ | at December 29, 2018 Using | ​ | ​ | ​
​ |  | Quoted Prices in |  | Significant Other |  | Significant |  | ​ | ​
​ | ​ | Active Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Description | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) | ​ | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 74,990 | ​ | $ | — | ​ | $ | — | ​ | $ | 74,990
Corporate debt securities | ​ | ​ | — | ​ | ​ | 18,820 | ​ | ​ | — | ​ | ​ | 18,820
Government debt securities | ​ | ​ | 9,338 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,338
Total cash equivalents | ​ | $ | 84,328 | ​ | $ | 18,820 | ​ | $ | — | ​ | $ | 103,148
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government debt securities | ​ | $ | 48,141 | ​ | $ | 99,211 | ​ | $ | — | ​ | $ | 147,352
Corporate debt securities | ​ |  | — | ​ | ​ | 269,427 | ​ | ​ | — | ​ | ​ | 269,427
Total short-term investments | ​ | $ | 48,141 | ​ | $ | 368,638 | ​ | $ | — | ​ | $ | 416,779
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other assets, net: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Auction rate securities | ​ | $ | — | ​ | $ | — | ​ | $ | 5,759 | ​ | $ | 5,759
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 5,759 | ​ | $ | 5,759
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 132,469 | ​ | $ | 387,458 | ​ | $ | 5,759 | ​ | $ | 525,686
Schedule of maturities of the Company's available-for-sale investments | The following summarizes the contractual underlying maturities of the Company’s available-for-sale investments at September 28, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Fair
​ | ​ | Cost | ​ | Value
Due in one year or less | ​ | $ | 408,664 | ​ | $ | 409,445
Due after one year through ten years | ​ | ​ | 176,798 | ​ | ​ | 177,497
Due after ten years | ​ | ​ | 10,300 | ​ | ​ | 10,015
​ | ​ | $ | 595,762 | ​ | $ | 596,957
Schedule of available-for-sale investments in continuous unrealized loss position by length of time | The available-for-sale investments that were in a continuous unrealized loss position, aggregated by length of time that individual securities have been in a continuous loss position, were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
As of September 28, 2019 | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
Government debt securities | ​ | $ | 23,804 | ​ | $ | (30) | ​ | $ | 20,922 | ​ | $ | (35) | ​ | $ | 44,726 | ​ | $ | (65)
Corporate debt securities | ​ | ​ | 56,374 | ​ | ​ | (100) | ​ | ​ | 8,555 | ​ | ​ | (2) | ​ | ​ | 64,929 | ​ | ​ | (102)
Auction rate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,715 | ​ | ​ | (285) | ​ | ​ | 5,715 | ​ | ​ | (285)
​ | ​ | $ | 80,178 | ​ | $ | (130) | ​ | $ | 35,192 | ​ | $ | (322) | ​ | $ | 115,370 | ​ | $ | (452)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
As of December 29, 2018 | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
Government debt securities | ​ | $ | 13,278 | ​ | $ | (10) | ​ | $ | 88,696 | ​ | $ | (583) | ​ | $ | 101,974 | ​ | $ | (593)
Corporate debt securities | ​ | ​ | 112,699 | ​ | ​ | (273) | ​ | ​ | 76,310 | ​ | ​ | (448) | ​ | ​ | 189,009 | ​ | ​ | (721)
Auction rate securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,759 | ​ | ​ | (241) | ​ | ​ | 5,759 | ​ | ​ | (241)
​ | ​ | $ | 125,977 | ​ | $ | (283) | ​ | $ | 170,765 | ​ | $ | (1,272) | ​ | $ | 296,742 | ​ | $ | (1,555)
Summary of quantitative information about level 3 fair value measurements | Auction rate securities ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair Value at | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 28, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​
(000s) |  | Valuation Technique |  | Unobservable Input |  | Weighted Average | ​
$ | 5,715 |  | Discounted cash flow |  | Estimated yield | ​ | 3.59% | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Expected holding period | ​ | 10 years | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Estimated discount rate | ​ | 2.67% | ​
Summary of activity in Level 3 financial instruments | ​ The following summarizes the activity in Level 3 financial instruments for the three and nine months ended September 28, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Assets | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ |  | Three Months |  | Nine Months
Auction Rate Securities | ​ | Ended |  | Ended
Beginning balance | ​ | $ | 5,647 | ​ | $ | 5,759
Gain (loss) included in other comprehensive income (loss) | ​ |  | 68 | ​ |  | (44)
Balance at September 28, 2019 | ​ | $ | 5,715 | ​ | $ | 5,715

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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