Summary of Significant Accounting Policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018
Existing technology and related patents | Minimum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	3 years
Existing technology and related patents | Maximum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	15 years
Customer and distributor relationships | Minimum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	5 years
Customer and distributor relationships | Maximum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	15 years
Trade names | Minimum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	5 years
Trade names | Maximum
Estimated useful lives of intangible assets:
Estimated useful lives of intangible assets	15 years