Stockholders' Equity Stock-Based Compensation - Summary of Status of Stock Option Activity (Details) - $ / shares shares in Thousands	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Shares
Stock options outstanding, beginning (in shares)	944
Granted (in shares)	141
Exercised (in shares)	(279)
Stock options cancelled (in shares)	(12)
Stock options outstanding, ending (in shares)	794
Weighted-average exercise price per share
Stock options outstanding beginning, weighted average exercise price (in USD per share)	$ 30.63
Stock options granted, weighted average exercise price (in USD per share)		$ 93.15
Stock options exercised, weighted average exercise price (in USD per share)		21.07
Stock options cancelled, weighted average exercise price (in USD per share)		$ 43.34
Stock options outstanding ending, weighted average exercise price (in USD per share)	$ 44.89

Share-based Compensation Arrangement by Share-based Payment Award, fair value weighted average [Roll Forward]

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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.

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

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

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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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- Definition

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

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