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Marketable Securities - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 7,234 | $ 6,934
Gross Unrealized Gains | 0 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | 7,234 | 6,934
Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 124,204 | 128,212
Gross Unrealized Gains | 21 | 12
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | 124,225 | 128,224
Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,234 | 6,934
Gross Unrealized Gains | 0 |
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | 7,234 | 6,934
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 116,970 | 121,278
Gross Unrealized Gains | 21 | 12
Gross Unrealized (Losses) | 0 |
Estimated Fair Value | $ 116,991 | $ 121,290

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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=28360136&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity 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 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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