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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Total Operating Expenses |  | $ 3,566,859 |  | $ 3,273,146 | $ 6,748,971 |  | $ 6,079,720
Stock-Based Compensation Expenses |  | $ 38,566 |  | 31,804 | $ 77,653 |  | 67,289
Common Shares Available for Grant |  | 13,000,000.0 |  |  | 13,000,000.0 |  |
Stock Options and SARs |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense related to stock options, SAR and ESPP grants |  | $ 13,600 |  | $ 11,700 | $ 27,500 |  | $ 23,700
Unrecognized compensation expense | [1] | $ 81,300 |  |  | $ 81,300 |  |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  |  |  | 1 year 7 months 6 days |  |
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Weighted Average Fair Value of Grants (price per share) |  |  |  |  | $ 25.68 |  | $ 29.18
Expected Volatility (in hundredths) |  |  |  |  | 31.50% |  | 28.88%
Risk-Free Interest Rate (in hundredths) |  |  |  |  | 2.38% |  | 2.23%
Dividend Yield (in hundredths) |  |  |  |  | 0.96% |  | 0.67%
Expected Life (in years) |  |  |  |  | 5 years 1 month 6 days |  | 5 years
Stock Options and SARs Rollforward [Abstract] |  |  |  |  |  |  |
Outstanding at January 1 (in shares) |  |  |  |  | 8,310,000 |  | 9,103,000
Granted (in shares) |  |  |  |  | 32,000 |  | 32,000
Exercised (1) (in shares) | [1] |  |  |  | (157,000) |  | (1,662,000)
Forfeited (in shares) |  |  |  |  | (107,000) |  | (124,000)
Outstanding at June 30 (2) (in shares) | [2] | 8,078,000 |  | 7,349,000 | 8,078,000 |  | 7,349,000
Stock Options and SARs Vested or Expected to Vest (3) (in shares) | [3] | 7,741,000 |  | 7,006,000 | 7,741,000 |  | 7,006,000
Stock Options and SARs Exercisable at March 31 (4) (in shares) | [4] | 3,905,000 |  | 2,938,000 | 3,905,000 |  | 2,938,000
Intrinsic Value of Stock Options/SARs Exercised | [1] |  |  |  | $ 3,900 |  | $ 74,500
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding (in years) |  |  |  |  | 4 years |  | 4 years 3 months 18 days
Intrinsic Value of Stock Options/SARs Vested or Expected to Vest | [1] | $ 44,400 |  | $ 266,200 | $ 44,400 |  | $ 266,200
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years) |  |  |  |  | 3 years 10 months 24 days |  | 4 years 3 months 18 days
Aggregate Intrinsic Value for Exercisable Units | [1] | 37,100 |  | 134,200 | $ 37,100 |  | $ 134,200
Weighted average remaining contractual life for exercisable options/SARs (in years) |  |  |  |  | 2 years 6 months |  | 2 years 8 months 12 days
Weighted Average Grant Price Stock Option and SARs [Rollforward] |  |  |  |  |  |  |
Intrinsic Value of Stock Options/SARs Outstanding | [1] | $ 45,000 |  | $ 277,200 | $ 45,000 |  | $ 277,200
Outstanding at January 1 (price per share) |  |  |  |  | $ 96.90 |  | $ 83.89
Granted (price per share) |  |  |  |  | 93.29 |  | 110.17
Exercised (1) (price per share) | [1] |  |  |  | 73.39 |  | 71.33
Forfeited (price per share) |  |  |  |  | 105.47 |  | 92.07
Outstanding at June 30 (2) (price per share) | [2] | $ 97.23 |  | $ 86.71 | 97.23 |  | 86.71
Vested or Expected to Vest (3) (price per share) | [3] | 96.78 |  | 86.44 | 96.78 |  | 86.44
Exercisable at June 30 (4) (price per share) | [4] | $ 86.71 |  | $ 78.74 | 86.71 |  | 78.74
ESPP |  |  |  |  |  |  |
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract] |  |  |  |  |  |  |
Weighted Average Fair Value of Grants (price per share) |  |  |  |  | $ 22.98 |  | $ 23.27
Expected Volatility (in hundredths) |  |  |  |  | 36.31% |  | 22.04%
Risk-Free Interest Rate (in hundredths) |  |  |  |  | 2.48% |  | 1.60%
Dividend Yield (in hundredths) |  |  |  |  | 0.83% |  | 0.66%
Expected Life (in years) |  |  |  |  | 15 days |  | 15 days
Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense | [1] | $ 158,200 |  |  | $ 158,200 |  |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  |  |  | 1 year 8 months 12 days |  |
Intrinsic value released during the year | [1] |  |  |  | $ 35,700 |  | $ 34,900
Aggregate intrinsic value of stock and units outstanding | [1] | 347,500 |  | $ 468,200 | 347,500 |  | 468,200
Restricted Stock/Restricted Stock Units [Roll Forward] |  |  |  |  |  |  |
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost | [1] | $ 23,100 |  | $ 19,000 | $ 46,400 |  | $ 41,300
Outstanding at January 1 (in shares) |  |  |  |  | 3,792,000 |  | 3,905,000
Granted (in shares) |  |  |  |  | 401,000 |  | 309,000
Released (1) (in shares) | [5] |  |  |  | (395,000) |  | (331,000)
Forfeited (in shares) |  |  |  |  | (68,000) |  | (120,000)
Outstanding at June 30 (2) (in shares) | [6] | 3,730,000 |  | 3,763,000 | 3,730,000 |  | 3,763,000
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward] |  |  |  |  |  |  |
Outstanding at January 1 (price per share) |  |  |  |  | $ 96.64 |  | $ 88.57
Granted (price per share) |  |  |  |  | 96.22 |  | 103.52
Released (1) (price per share) | [5] |  |  |  | 93.84 |  | 69.55
Forfeited (price per share) |  |  |  |  | 98.27 |  | 91.28
Outstanding at June 30 (2) (price per share) | [6] | $ 96.86 |  | $ 91.39 | $ 96.86 |  | $ 91.39
Performance Unit |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-Based Compensation Expenses | [1] | $ 1,900 |  | $ 1,100 | $ 3,800 |  | $ 2,300
Unrecognized compensation expense |  | 6,000 |  |  | $ 6,000 |  |
Weighted average period over which unrecognized compensation expense will be recognized (in years) |  |  |  |  | 1 year 2 months 12 days |  |
Intrinsic value released during the year | [1] |  |  |  | $ 7,700 |  |
Aggregate intrinsic value of stock and units outstanding |  | $ 49,200 |  | $ 71,400 | $ 49,200 |  | $ 71,400
Minimum Performance Units and Stock Allowed to be Outstanding |  |  |  |  | 205 |  |
Maximum Performance Units and Stock Allowed to be Outstanding |  |  |  |  | 852 |  |
Restricted Stock/Restricted Stock Units [Roll Forward] |  |  |  |  |  |  |
Outstanding at January 1 (in shares) |  |  |  |  | 539 |  | 502
Granted (in shares) |  |  |  |  | 0 |  | 0
Granted for Performance Multiple (1) | [7] |  |  |  | 72 |  | 72
Released (1) (in shares) |  |  |  |  | 83 |  | 0
Forfeited (in shares) |  |  |  |  | 0 |  | 0
Outstanding at June 30 (2) (in shares) | [8] | 528 | [9] | 574 | 528 | [9] | 574
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward] |  |  |  |  |  |  |
Outstanding at January 1 (price per share) |  |  |  |  | $ 101.53 |  | $ 90.96
Granted (price per share) |  |  |  |  | 0 |  | 0
Granted for Performance Multiple (1) (in dollars per share) | [7] |  |  |  | 69.43 |  | 101.87
Released (1) (price per share) |  |  |  |  | 85.65 |  | 0
Forfeited (price per share) |  |  |  |  | 0 |  | 0
Outstanding at June 30 (2) (price per share) | [8] | $ 99.64 |  | $ 92.33 | $ 99.64 |  | $ 92.33
Performance Units and Performance Stock Disclosures [Abstract] |  |  |  |  |  |  |
Performance Period for Performance Units and Shares |  | 3 years |  |  |  |  |
Minimum Performance Multiple at the Completion of the Performance Period |  | 0.00% |  |  |  |  |
Maximum Performance Multiple at the Completion of the Performance Period |  | 200.00% |  |  | 200.00% |  |
Lease and Well |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-Based Compensation Expenses |  | $ 13,600 |  | $ 11,400 | $ 27,300 |  | $ 24,200
Gathering and Processing Costs |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-Based Compensation Expenses |  | 300 |  | 100 | 500 |  | 200
Exploration Costs |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-Based Compensation Expenses |  | 6,500 |  | 5,700 | 13,000 |  | 12,600
General and Administrative |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |
Stock-Based Compensation Expenses |  | $ 18,200 |  | $ 14,600 | $ 36,900 |  | $ 30,300
[1] | The total intrinsic value of stock options/SARs exercised during the six months ended June 30, 2019 and 2018 was $3.9 million and $74.5 million, respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs.
[2] | The total intrinsic value of stock options/SARs outstanding at June 30, 2019 and 2018 was $45.0 million and $277.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 4.0 years and 4.3 years, respectively.
[3] | The total intrinsic value of stock options/SARs vested or expected to vest at June 30, 2019 and 2018 was $44.4 million and $266.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 3.9 years and 4.3 years, respectively.
[4] | The total intrinsic value of stock options/SARs exercisable at June 30, 2019 and 2018 was $37.1 million and $134.2 million, respectively. At June 30, 2019 and 2018, the weighted average remaining contractual life was 2.5 years and 2.7 years, respectively.
[5] | The total intrinsic value of restricted stock and restricted stock units released during the six months ended June 30, 2019 and 2018 was $35.7 million and $34.9 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released.
[6] | The total intrinsic value of restricted stock and restricted stock units outstanding at June 30, 2019 and 2018 was $347.5 million and $468.2 million, respectively.
[7] | Upon completion of the Performance Period for the performance units granted in 2015 and 2014, a performance multiple of 200% was applied to each of the grants resulting in additional grants of performance units in February 2019 and February 2018, respectively.
[8] | The total intrinsic value of performance units outstanding at June 30, 2019 and 2018 was approximately $49.2 million and $71.4 million, respectively.
[9] | Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 205 and a maximum of 852 performance units could be outstanding.

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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 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=116856206&loc=d3e5070-113901 + Details
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- 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. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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- Definition Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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