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Fair Value Measurements - Key inputs used in available-for-sale investments valuation (Details) - Available-for-sale Securities - Level 3	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Discount rate
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments			0.23
Discount rate | Under the Status Quo
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.225
Discount rate | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.17
Lack of marketability discount ("DLOM")
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments	0.05		0.25
Lack of marketability discount ("DLOM") | Under the Status Quo
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.20
Lack of marketability discount ("DLOM") | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.15
Volatility
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments	0.457		0.453
Volatility | Under the Status Quo
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.445
Volatility | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.448
Revenue growth rate | Minimum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments			0.050
Revenue growth rate | Maximum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments			0.938
Revenue growth rate | Under the Status Quo | Minimum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.037
Revenue growth rate | Under the Status Quo | Maximum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.758
Revenue growth rate | Under the Trade Sale | Minimum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.037
Revenue growth rate | Under the Trade Sale | Maximum
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.758
Terminal growth rate
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments			0.03
Terminal growth rate | Under the Status Quo
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.03
Terminal growth rate | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.03
Control premium | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.30
Probability of each scenario | Under the Status Quo
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.60
Probability of each scenario | Under the Trade Sale
Key inputs used in available-for-sale investments valuation
Inputs used in valuation of available-for-sale investments		0.40

X

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- 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.

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