Stock-Based Compensation - Summary of Status of Plans (Details)	6 Months Ended
Jun. 30, 2021 shares
2018 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	2,500,000
Stock options outstanding	645,035
RSUs and cash settled awards vested and released	116,967
Awards available for grant	1,737,998
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	1,500,000
Stock options outstanding	35,100
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	3,400,000
Stock options outstanding	45,200
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	6,500,000
Stock options outstanding	14,545
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding	4,722

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Released Life-to-Date

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- Definition

Share based compensation arrangement by share based payment award number of shares originally available.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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