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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Detail) - shares shares in Thousands	Sep. 30, 2015	Dec. 31, 2014
Equity [Abstract]
Warrants outstanding	22,308	8,540
Stock options outstanding	11,188	8,590
Options reserved for future issuance under the Company's 2007 Incentive Plan	10,251
Shares reserved for future issuance under the Employee Stock Purchase Plan	528
Total reserved for future issuance	44,275

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Common Stock Capital Shares Reserved For Future Issuance Of Employee Stock Purchase Plan

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Options reserved for future issuance under the Company's 2007 Incentive Plan.

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- Definition

Number of warrants or rights outstanding.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.4-08.(i))



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Name Regulation S-X (SX)



-Number 210



-Section 08



-Paragraph i



-Article 4

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Aggregate number of common shares reserved for future issuance.

+ 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 210.5-02.29)



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Number of options outstanding, including both vested and non-vested options.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)(1)(i)-(ii)



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