Capital Stock (Authorized, Issued and Reserved shares of common stock) (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	May 17, 2013
Reserved for issuance	99,439,211
Strike Price		$ 0.2745
Total common shares issued and outstanding at March 31, 2015	172,738,162
Total common shares outstanding and reserved for issuance at March 31, 2015	272,177,373
Warrants with common stock additional purchase rights associated with December 2014 private placement [Member]
Reserved for issuance	50,189,431
Strike Price	$ 0.1003
Expiry	Dec. 23, 2021
Warrants to purchase common stock associated with September 2014 consulting agreement with Danforth Advisors [Member]
Reserved for issuance	100,000
Strike Price	$ 0.2500
Expiry	Sep. 08, 2024
Shares reserved under outstanding stock options and options available for grant [Member]
Reserved for issuance	10,689,000
Rights Associated With Employee Stock Purchase Plan [Member]
Reserved for issuance	449,132
Warrants to purchase common stock associated with December 2014 venture loan and security agreement [Member]
Reserved for issuance	2,492,523
Strike Price	$ 0.1003
Expiry	Dec. 23, 2024
Warrant Two [Member]
Reserved for issuance	437,158
Strike Price	$ 0.2745
Expiry	Jun. 29, 2017
Warrant Three [Member]
Reserved for issuance	20,655,737
Strike Price	$ 0.2745
Expiry	May 17, 2020
Warrant Four [Member]
Reserved for issuance	14,426,230
Strike Price	$ 0.2745
Expiry	Aug. 09, 2020

It represents common shares reserved issued outstanding.

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- Definition

It represents common stock capital shares reserved for future issuance.

+ References

No definition available.

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- Definition

Expiration date of warrants held.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column A

+ Details

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- Definition

Exercise price per share or per unit 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)(4))

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

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- Definition

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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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