Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
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-Topic 718
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

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

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

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No definition available.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Shareholders' Equity - Stock Option and RSU Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding (in shares)	15,031,388	12,737,893
Stock options granted (in shares)	1,259,025	2,985,495
Stock options exercised (in shares)	(4,665,059)	(305,649)
Stock options forfeited (in shares)	(421,328)	(386,351)
Options outstanding, ending balance (in shares)	11,204,026	15,031,388	12,737,893
Stock options exercisable				6,902,359
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options outstanding, beginning balance, weighted average exercise price (in dollars per share)	$ 1.31	$ 0.38
Stock options granted, weighted average exercise price (in dollars per share)	22.16	5.28
Stock options exercised, weighted average exercise price (in dollars per share)	0.34	0.46
Stock options forfeited, weighted average exercise price (in dollars per share)	12.04	1.40
Options outstanding, ending balance, weighted average exercise price (in dollars per share)	$ 1.31	$ 0.38	$ 0.38	$ 3.65	$ 1.31
Stock options exercisable, weighted average exercise price (in dollars per share)				$ 0.82
Stock options outstanding, remaining contractual term	6 years 11 months 27 days	7 years 1 month 28 days
Stock options exercisable, remaining contractual term	6 years 11 days
Stock options outstanding, aggregate intrinsic value			$ 0	$ 248,119	$ 73,642
Stock options exercisable, aggregate intrinsic value				172,415
Stock options granted, weighted average grant date fair value	$ 12.16	$ 5.63
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Remaining unamortized compensation cost related to unvested stock options				$ 34,572	$ 16,574
Remaining unamortized compensation cost related to unvested stock options, period of recognition	3 years 2 months 19 days
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
RSUs outstanding, beginning balance (in shares)	0	0
RSUs granted	503,701
RSUs forfeited	(75,135)
RSUs outstanding, ending balance (in shares)	428,566	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
RSUs outstanding, beginning balance, average grant date fair value	$ 0.00	$ 0.00
RSUs granted, average grant date fair value	32.01
RSUs forfeited/cancelled, average grant date fair value	30.95
RSUs outstanding, ending balance, average grant date fair value	$ 32.19	$ 0.00	$ 0.00
Class A Subordinate Voting \| Stock Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock options exercisable				684,125
Class B Multiple Voting \| Legacy Option Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock options exercisable				10,519,901