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Fair Value Measurement - Narrative (Details) - Series B Preferred Stock - Coursera Inc - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 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
Gain on sale of investment $ 6,100 $ 6,473  
Fair value of an investment   $ 11,473