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Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Shares
Beginning balance (in shares)	56,966,000
Granted (in shares)	1,130,000	0
Exercised (in shares)	(28,855,000)
Ending balance (in shares)	29,241,000
Exercisable (in shares)	28,322,000
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 2.25
Granted (in dollars per share)	22.35
Exercised (in dollars per share)	2.25
Ending balance (in dollars per share)	3.03
Exercisable (in dollars per share)	$ 2.41
Weighted-Average Remaining Contractual Term, Outstanding	3 years 1 month 6 days	3 years 6 months
Weighted-Average Remaining Contractual Term, Exercisable	2 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding	$ 1,124,964		$ 933,299
Aggregate Intrinsic Value, Exercisable	$ 1,107,358

X

- Definition

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

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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 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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