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Financial Assets and Liabilities - SBI Investment (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers of financial instruments between levels	$ 0	$ 0
SBI
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate applied to cash flow forecasts to determine initial fair value of equity method investment.	15.00%
Market approach average price/earnings multiples of comparable companies to corroborate the income approach	12.6
Time period of projected income to determine fair value of equity method investment	5 years

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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.

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Market approach average price/earnings multiples of comparable companies to .the income approach.

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Discount rate applied to cash flow forecasts to determine initial fair value of equity method investment.

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Amount of transfers of assets measured on a recurring basis in and out of the levels of fair value hierarchy.

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The time period of projected income to determine fair value of equity method investment.

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