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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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The estimated measure of the maximum 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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No definition available.

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The estimated measure of the minimum 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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No definition available.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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

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No definition available.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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Stockholders' Equity - Summary of Fair Value of Stock-based Awards Estimated using Black-Scholes Option-Pricing Model (Details)				3 Months Ended		6 Months Ended
	May. 18, 2015	Nov. 16, 2014	Mar. 26, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	43.00%	33.00%	58.00%
ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)				6 months	7 months 21 days	6 months	7 months 21 days
Expected volatility					58.00%		58.00%
Expected volatility, minimum				33.00%		33.00%
Expected volatility, maximum				43.00%		43.00%
Risk-free interest rate					0.06%		0.06%
Risk-free interest rate, minimum				0.07%		0.07%
Risk-free interest rate, maximum				0.08%		0.08%
Expected dividend yield				0.00%	0.00%	0.00%	0.00%
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)				6 years 1 month 10 days	5 years 10 months 6 days		6 years 15 days
Expected volatility				39.00%	58.00%	39.00%	58.00%
Risk-free interest rate				1.96%	1.81%		1.80%
Risk-free interest rate, minimum						1.74%
Risk-free interest rate, maximum						1.96%
Expected dividend yield				0.00%	0.00%	0.00%	0.00%
Stock Option \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)						6 years 29 days
Stock Option \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)						6 years 1 month 10 days