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v3.20.2

Unaudited Consolidated Statements of Stockholders' Equity (Parenthetical) | 12 Months Ended
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Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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