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Short-Term Investments - Summary of Short-Term Investments (Detail) - USD ($) $ in Thousands | Oct. 02, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 25,986 | $ 31,845
Gross Unrealized Gains | 16 | 19
Gross Unrealized Losses | (12) | (17)
Total short-term investments, Estimated Fair Value | 25,990 | 31,847
State, municipal and local government agencies bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2,502 | 13,946
Gross Unrealized Gains | 1 | 16
Gross Unrealized Losses | 0 | (1)
Total short-term investments, Estimated Fair Value | 2,503 | 13,961
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 23,484 | 17,899
Gross Unrealized Gains | 15 | 3
Gross Unrealized Losses | (12) | (16)
Total short-term investments, Estimated Fair Value | $ 23,487 | $ 17,886

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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