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Cash Cash Equivalents and Marketable Securities - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 Investment | Sep. 30, 2013 Minimum | Dec. 31, 2012 Minimum
Cash, cash equivalents and marketable securities [Line Items] |  |  |
Marketable securities, minimum original maturity term |  | 90 days | 90 days
Long-term marketable securities, minimum original maturity term |  | 1 year | 1 year
Marketable securities, average remaining contractual maturity period | 7 months 14 days |  |
Number of debt securities in unrealized loss positions | 19 |  |
Debt securities in unrealized loss positions, total unrealized loss | $ 3,000 |  |
Debt securities in unrealized loss positions, total fair market value | $ 4,410,000 |  |

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- Definition Long Term Marketable Securities Maturities Term, Minimum + References No definition available. + Details
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- Definition Marketable Securities, Maturity Term + References No definition available. + Details
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- Definition Marketable Securities, Remaining Maturity + References No definition available. + Details
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- Definition Amount of unrealized loss on 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 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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