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Marketable Securities - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 128,212 | $ 73,262
Gross Unrealized Gains | 12 | 26
Gross Unrealized (Losses) |  |
Estimated Fair Value | 128,224 | 73,288
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,934 | 18,836
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value | 6,934 | 18,836
Money market funds [Member] | Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,934 | 15,839
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value | 6,934 | 15,839
U.S. government sponsored entity debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 2,997
Gross Unrealized Gains |  |
Gross Unrealized (Losses) |  |
Estimated Fair Value |  | 2,997
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 121,278 | 54,426
Gross Unrealized Gains | 12 | 26
Gross Unrealized (Losses) |  |
Estimated Fair Value | $ 121,290 | $ 54,452

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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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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -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 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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