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Stock-Based Compensation - Detailed Information Regarding Active Stock Incentive Plans (Details)	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares available for grant under the plan (in shares)	969,150
Outstanding shares granted under the plan (in shares)	800,577
2003 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial shares available for grant under the plan (in shares)	1,000,000
Remaining shares available for grant under the plan (in shares)	0
Outstanding shares granted under the plan (in shares)	14,391
2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial shares available for grant under the plan (in shares)	1,000,000
Remaining shares available for grant under the plan (in shares)	0
Outstanding shares granted under the plan (in shares)	51,092
2010 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial shares available for grant under the plan (in shares)	1,000,000
Remaining shares available for grant under the plan (in shares)	0
Outstanding shares granted under the plan (in shares)	198,971
2014 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial shares available for grant under the plan (in shares)	1,100,000
Remaining shares available for grant under the plan (in shares)	0
Outstanding shares granted under the plan (in shares)	520,273
2018 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial shares available for grant under the plan (in shares)	1,000,000
Remaining shares available for grant under the plan (in shares)	969,150
Outstanding shares granted under the plan (in shares)	15,850

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other Than Options, Outstanding, Number

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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