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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Oct. 01, 2016 | Jan. 02, 2016
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 131,139 | $ 128,901
Total long-term investments | 6,980 | 7,126
Assets and liabilities measured at fair value on recurring basis |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 39,457 | 55,014
Total short-term investments | 131,139 | 128,901
Total long-term investments | 6,980 | 7,126
Derivative instruments | 72 | 92
Other assets, net | 72 | 92
Total assets at fair value | 177,648 | 191,133
Total liabilities at fair value |  | 14,073
Assets and liabilities measured at fair value on recurring basis | Accrued expenses: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, current |  | 4,749
Assets and liabilities measured at fair value on recurring basis | Other non-current liabilities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, noncurrent |  | 9,324
Assets and liabilities measured at fair value on recurring basis | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 36,200 | 37,721
Assets and liabilities measured at fair value on recurring basis | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 2,956 | 2,845
Total short-term investments |  | 8,000
Assets and liabilities measured at fair value on recurring basis | U.S. government agency |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,599
Total short-term investments |  | 3,998
Assets and liabilities measured at fair value on recurring basis | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 301 | 1,577
Total short-term investments | 60,682 | 93,516
Assets and liabilities measured at fair value on recurring basis | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 22,306 | 996
Assets and liabilities measured at fair value on recurring basis | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 15,324 | 8,995
Assets and liabilities measured at fair value on recurring basis | U.S. government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 14,392 |
Assets and liabilities measured at fair value on recurring basis | Asset-backed securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 10,961 |
Assets and liabilities measured at fair value on recurring basis | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 11,272
Total short-term investments | 6,466 | 11,176
Assets and liabilities measured at fair value on recurring basis | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 1,008 | 2,220
Assets and liabilities measured at fair value on recurring basis | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 6,980 | 7,126
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 | 36,200 | 37,721
Total short-term investments | 14,392 |
Total assets at fair value | 50,592 | 37,721
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 | 36,200 | 37,721
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 | 14,392 |
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 | 3,257 | 17,293
Total short-term investments | 116,747 | 128,901
Derivative instruments | 72 | 92
Other assets, net | 72 | 92
Total assets at fair value | 120,076 | 146,286
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 | 2,956 | 2,845
Total short-term investments |  | 8,000
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | U.S. government agency |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,599
Total short-term investments |  | 3,998
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 | 301 | 1,577
Total short-term investments | 60,682 | 93,516
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 short-term investments | 22,306 | 996
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 | 15,324 | 8,995
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 | 10,961 |
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 |  | 11,272
Total short-term investments | 6,466 | 11,176
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 | 1,008 | 2,220
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 | 6,980 | 7,126
Total assets at fair value | 6,980 | 7,126
Total liabilities at fair value |  | 14,073
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Accrued expenses: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, current |  | 4,749
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Other non-current liabilities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, noncurrent |  | 9,324
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 | $ 6,980 | $ 7,126

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