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Investments in Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 17,695 | $ 19,326
Gross Unrealized Gain | 7 | 7
Gross Unrealized Loss | (3) | (18)
Fair Value | 17,699 | 19,315
Marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 16,478 | 17,688
Gross Unrealized Gain | 7 | 7
Gross Unrealized Loss | (3) | (13)
Fair Value | 16,482 | 17,682
Marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,778 | 7,029
Gross Unrealized Loss |  | (6)
Fair Value | 5,778 | 7,023
Marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,700 | 10,659
Gross Unrealized Gain | 7 | 7
Gross Unrealized Loss | (3) | (7)
Fair Value | 10,704 | 10,659
Long-term marketable securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,217 | 1,638
Gross Unrealized Loss |  | (5)
Fair Value | 1,217 | 1,633
Long-term marketable securities | U.S. Government and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 417 | 838
Gross Unrealized Loss |  | (2)
Fair Value | 417 | 836
Long-term marketable securities | Corporate and other debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 | 800
Gross Unrealized Loss |  | (3)
Fair Value | $ 800 | $ 797

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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 before tax of unrealized loss 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 (c) -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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