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Summary of Significant Accounting Policies - Finite Lived Assets (Details) | 12 Months Ended
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Dec. 31, 2018
Trade names |
Finite lived intangible assets - useful lives [Abstract] |
Estimated Useful Life | 5 years
Minimum | Trade names |
Finite lived intangible assets - useful lives [Abstract] |
Estimated Useful Life | 2 years
Minimum | Other |
Finite lived intangible assets - useful lives [Abstract] |
Estimated Useful Life | 3 years
Maximum | Trade names |
Finite lived intangible assets - useful lives [Abstract] |
Estimated Useful Life | 5 years
Maximum | Other |
Finite lived intangible assets - useful lives [Abstract] |
Estimated Useful Life | 9 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |