Represents the percentage of stock awards vesting each month.

No definition available.

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- Definition

Represents the percentage of stock awards vesting each year.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of awards that will immediately vest if outstanding awards are not assumed or replaced by a successor corporation.

+ References

No definition available.

+ Details

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- Definition

The period of time, from the grant date until the time at which the share-based award expires.

+ References

No definition available.

+ Details

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 50

-Paragraph 2

-Subparagraph (a)(1)

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

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- Definition

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

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Summary of significant accounting policies (Details 8) (Stock options)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assumptions used to estimate fair market value of each stock based award granted
Expected volatility, low end of the range (as a percent)	38.48%	40.74%	45.13%
Expected volatility, high end of the range (as a percent)	41.98%	42.41%	47.36%
Risk-free interest rate, low end of the range (as a percent)	1.77%	0.94%	0.91%
Risk-free interest rate, high end of the range (as a percent)	2.02%	1.77%	1.39%
2006 Equity Incentive Plan
Stock-based expense
Percentage of awards that will immediately vest if outstanding awards are not assumed or replaced by successor	100.00%
2012 Equity Incentive Plan
Stock-based expense
Percentage of awards that will immediately vest if outstanding awards are not assumed or replaced by successor	100.00%
Minimum
Assumptions used to estimate fair market value of each stock based award granted
Expected life	5 years 10 months 17 days	5 years 6 months 4 days	5 years 3 months
Maximum
Assumptions used to estimate fair market value of each stock based award granted
Expected life	6 years 7 days	5 years 11 months 23 days	6 years
Employees
Stock-based expense
Vesting period	3 years
Expiration term	10 years
Employees \| Each 12 month anniversary
Stock-based expense
Vesting rights percentage	33.00%
Board of Directors, Directors
Stock-based expense
Expiration term	10 years
Board of Directors, Directors \| Initial Grant
Stock-based expense
Vesting period	3 years
Board of Directors, Directors \| Initial Grant \| 12 month anniversary
Stock-based expense
Vesting rights percentage	33.00%
Board of Directors, Directors \| Initial Grant \| Each month thereafter
Stock-based expense
Vesting rights percentage per month	2.77%
Board of Directors, Directors \| Annual Grant \| Each month
Stock-based expense
Vesting rights percentage per month	8.33%