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Cost Basis Investment - Additional Information (Detail) - Apr. 30, 2013 - RainDance - Series E Preferred Stock - USD ($) shares in Millions, $ in Millions	Total
Schedule of Cost-method Investments [Line Items]
Shares acquired	28
Value of shares acquired	$ 5.0
Maximum
Schedule of Cost-method Investments [Line Items]
Percentage of total shares outstanding acquired	5.00%

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Cost Method Investment, Ownership Percentage

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Cost Method Investment Shares Acquired

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



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-Subparagraph (SX 210.5-02.12)



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-Publisher FASB



-Name Accounting Standards Codification



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-Section 50



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