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Common Stock Incentive Plan - Summary (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
General and administrative expense |  |  |  |
Common Stock Incentive Plan |  |  |  |
Share-based compensation costs recognized |  | $ 27,300 | $ 13,900 | $ 12,000
Share-based compensation costs related to accelerated equity awards |  | $ 11,800 |  |
2012 Plan |  |  |  |
Common Stock Incentive Plan |  |  |  |
Plan term from the date of adoption |  | 10 years |  |
2012 Plan | Maximum |  |  |  |
Common Stock Incentive Plan |  |  |  |
Authorized shares |  | 3,985,734 |  |
CEO |  |  |  |
Severance Related Expense |  |  |  |
Cash | $ 9,817 |  |  |
Stock compensation | 17,902 |  |  |
Professional fees | 574 |  |  |
Total value of severance | 28,293 |  |  |
Amount accrued for CEO compensation prior to separation | (9,642) |  |  |
Incremental severance | $ 18,651 |  |  |

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- Definition This element represents the period of time from a share-based compensation plan's inception until the point at which no further common stock subject to options, stock purchase rights, stock appreciation rights, or SAR, and other awards may be granted under that specific plan. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 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.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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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 + Details
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