Stock-Based Compensation - Summary of Status of Plans (Details)	9 Months Ended
Sep. 30, 2020 shares
2018 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	2,500,000
Stock options outstanding	495,246
RSUs and cash settled awards vested and released	36,471
Awards available for grant	1,968,283
2014 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	1,500,000
Stock options outstanding	179,528
2009 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	3,400,000
Stock options outstanding	75,200
2004 Plan
Summary of Status of Equity-Based Compensation Plans
Awards originally available	6,500,000
Stock options outstanding	35,952
Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Stock options outstanding	5,522
RSUs \| 2018 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	495,246
RSUs \| 2014 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	179,528
RSUs \| 2009 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	75,200
RSUs \| 2004 Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	35,952
RSUs \| Directors' Plan
Summary of Status of Equity-Based Compensation Plans
Shares outstanding	5,522

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

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

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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