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Investments in Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 19,326 | $ 26,643
Gross Unrealized Gain | 7 | 6
Gross Unrealized Loss | (18) | (9)
Fair Value | 19,315 | 26,640
Marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 17,688 | 23,089
Gross Unrealized Gain | 7 | 6
Gross Unrealized Loss | (13) | (5)
Fair Value | 17,682 | 23,090
Marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,029 | 12,716
Gross Unrealized Gain |  | 2
Gross Unrealized Loss | (6) | (2)
Fair Value | 7,023 | 12,716
Marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,659 | 10,373
Gross Unrealized Gain | 7 | 4
Gross Unrealized Loss | (7) | (3)
Fair Value | 10,659 | 10,374
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,638 | 3,554
Gross Unrealized Loss | (5) | (4)
Fair Value | 1,633 | 3,550
Long-term marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 838 | 1,228
Gross Unrealized Loss | (2) |
Fair Value | 836 | 1,228
Long-term marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 | 2,326
Gross Unrealized Loss | (3) | (4)
Fair Value | $ 797 | $ 2,322

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt 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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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