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Stockholders' Equity - Fair Value of Employee Stock Options (Detail) - $ / shares	1 Months Ended		3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Jun. 30, 2015	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Dividend yield			0.00%	0.00%
Volatility	76.78%	96.90%	74.25%	78.02%
Risk-free interest rate	1.37%	0.60%	1.65%	1.56%
Expected life of options			6 years	6 years
Weighted average grant date fair value			$ 3.22	$ 4.94

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- References

No definition available.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ 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 (f)(2)(iii)



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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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