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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 396,327 | $ 153,961
Total long-term investments | 5,257 | 5,196
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 85,090 | 69,432
Total short-term investments | 50,437 | 12,416
Total assets at fair value | 135,527 | 81,848
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 85,090 | 69,432
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 50,437 | 12,416
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 70,297 | 11,057
Total short-term investments | 345,890 | 141,545
Derivative instruments |  | 1,808
Other assets, net |  | 1,808
Total assets at fair value | 416,187 | 154,410
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 32,183 | 7,153
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 6,034 | 3,904
Total short-term investments | 78,555 | 79,702
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 1,498 |
Total short-term investments | 108,828 | 31,036
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 117,770 | 16,400
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 25,519 | 8,173
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Agency bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 7,482 |
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 30,582 |
Total short-term investments | 6,239 | 5,233
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 1,497 | 1,001
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 5,257 | 5,196
Total assets at fair value | 5,257 | 5,196
Contingent consideration, noncurrent | 3,829 |
Total liabilities at fair value | 3,829 |
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 5,257 | 5,196
Assets and liabilities measured at fair value on recurring basis | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 155,387 | 80,489
Total short-term investments | 396,327 | 153,961
Total long-term investments | 5,257 | 5,196
Derivative instruments |  | 1,808
Other assets, net |  | 1,808
Total assets at fair value | 556,971 | 241,454
Contingent consideration, noncurrent | 3,829 |
Total liabilities at fair value | 3,829 |
Assets and liabilities measured at fair value on recurring basis | Fair Value | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 85,090 | 69,432
Assets and liabilities measured at fair value on recurring basis | Fair Value | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 32,183 | 7,153
Assets and liabilities measured at fair value on recurring basis | Fair Value | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 6,034 | 3,904
Total short-term investments | 78,555 | 79,702
Assets and liabilities measured at fair value on recurring basis | Fair Value | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 1,498 |
Total short-term investments | 108,828 | 31,036
Assets and liabilities measured at fair value on recurring basis | Fair Value | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 117,770 | 16,400
Assets and liabilities measured at fair value on recurring basis | Fair Value | U.S. government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 50,437 | 12,416
Assets and liabilities measured at fair value on recurring basis | Fair Value | Asset-backed securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 25,519 | 8,173
Assets and liabilities measured at fair value on recurring basis | Fair Value | Agency bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 7,482 |
Assets and liabilities measured at fair value on recurring basis | Fair Value | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 30,582 |
Total short-term investments | 6,239 | 5,233
Assets and liabilities measured at fair value on recurring basis | Fair Value | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 1,497 | 1,001
Assets and liabilities measured at fair value on recurring basis | Fair Value | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | $ 5,257 | $ 5,196

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