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Investments in Marketable Securities - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Type of Security (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 141,868 | $ 135,201
Fair Value | 142,656 | 134,255
Short-term investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 48,354 | 79,943
Gross Unrealized Gains | 24 | 0
Gross Unrealized Losses | (1) | (83)
Fair Value | 48,377 | 79,860
Short-term investments [Member] | U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,864 | 62,343
Gross Unrealized Gains | 15 | 0
Gross Unrealized Losses | (1) | (71)
Fair Value | 24,878 | 62,272
Short-term investments [Member] | U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,508 | 17,571
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 0 | (12)
Fair Value | 11,513 | 17,559
Short-term investments [Member] | Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,982 | 0
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 11,986 | 0
Short-term investments [Member] | Asset-backed securities and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 0 | 29
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 0 | 29
Long-term marketable securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 93,514 | 55,258
Gross Unrealized Gains | 844 | 5
Gross Unrealized Losses | (79) | (868)
Fair Value | 94,279 | 54,395
Long-term marketable securities [Member] | U.S. Treasuries [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 50,535 | 15,283
Gross Unrealized Gains | 172 | 0
Gross Unrealized Losses | (9) | (112)
Fair Value | 50,698 | 15,171
Long-term marketable securities [Member] | U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,989 | 12,107
Gross Unrealized Gains | 25 | 0
Gross Unrealized Losses | 0 | (85)
Fair Value | 16,014 | 12,022
Long-term marketable securities [Member] | Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,261 | 17,219
Gross Unrealized Gains | 529 | 5
Gross Unrealized Losses | (21) | (519)
Fair Value | 18,769 | 16,705
Long-term marketable securities [Member] | Asset-backed securities and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,729 | 10,649
Gross Unrealized Gains | 118 | 0
Gross Unrealized Losses | (49) | (152)
Fair Value | $ 8,798 | $ 10,497

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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=73527792&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=73527792&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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