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Summary of Significant Accounting Policies - Impairment of Long-Lived and Intangible Assets (Details)	3 Months Ended
	Mar. 31, 2019
Patents
Impairment of Long-Lived and Intangible Assets
Estimated useful lives of assets	20 years
Minimum | Proprietary Technology
Impairment of Long-Lived and Intangible Assets
Estimated useful lives of assets	3 years
Minimum | Customer relationships
Impairment of Long-Lived and Intangible Assets
Estimated useful lives of assets	5 years
Maximum | Proprietary Technology
Impairment of Long-Lived and Intangible Assets
Estimated useful lives of assets	7 years
Maximum | Customer relationships
Impairment of Long-Lived and Intangible Assets
Estimated useful lives of assets	12 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: