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Fair Value Measurement - Narrative (Details) - Series B Preferred Stock - Coursera Inc - USD ($) shares in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Share purchase (in shares) |  | 1,020
Payment to acquire investment |  | $ 5,000
Fair value of an investment | $ 11,116 |
Gain on sale of investment | $ 6,116 |

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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