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Summary of Available for Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 33,903 | $ 36,834
Gross Unrealized Gain | 8 | 7
Fair Value | 33,911 | 36,841
Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 9,648 | 8,650
Gross Unrealized Gain | 0 | 0
Fair Value | 9,648 | 8,650
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 20,243 | 23,165
Gross Unrealized Gain | 8 | 8
Fair Value | 20,251 | 23,173
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 4,012 | 5,019
Gross Unrealized Gain | 0 | (1)
Fair Value | $ 4,012 | $ 5,018

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- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacting investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. + References No definition available. + 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=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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