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Common Stock (Stock Option Activity and Additional Details) (Details) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Granted (in shares) |  | 3,000,000 |  |
Number of stock options vested (in shares) |  | 0 | 0 | 0
Time-Vested options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Granted (in shares) | 1,000,000.0 |  |  |
Vesting period in years |  | 5 years |  |
Performance-Based options |  |  |  |
Class of Stock [Line Items] |  |  |  |
Granted (in shares) | 2,000,000.0 |  |  |
Vesting period in years |  | 7 years |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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