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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
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