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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
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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 |

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- 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 + Details
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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. + Details
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