Stock-based Compensation - Summary of Stock Option Activity (Detail) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Schedule of Stockbased Compensation Details Stock Option Activities [Line Items]
Weighted average exercise price per share	$ 0.20		$ 0.84
Shares	7,114,250		25,429,000
Shares granted	0
Shares			25,429,000
Weighted average exercise price per share			$ 0.84
Three Months Ended March [Member]
Schedule of Stockbased Compensation Details Stock Option Activities [Line Items]
Shares granted		8,682,000
Shares exercised	0	0
Shares forfeited	(559,250)	(490,000)
Shares	6,555,000	33,621,000
Weighted average exercise price per share, granted		$ 1.83
Weighted average exercise price per share, exercised	$ 0	$ 0
Weighted average exercise price per share, forfeited	$ 0.29	$ 2.09
Weighted average exercise price per share	$ 0.19	$ 1.08

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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