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Summary of Significant Accounting Policies (Details 3)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer Concentration Risk
Equity Method Investment, Ownership Percentage	27.70%
Stock-Based Compensation and Equity Incentive Plans
Discount from the fair market value (as a percent)	15.00%
Cash and Cash Equivalents
Maximum original maturity of cash equivalents (in months)	3 months
Minimum
Intangible Assets
Useful life (in years)	1 year	1 year
Maximum
Intangible Assets
Useful life (in years)	10 years	10 years

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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