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Fair Value Measurement - Narrative (Details) - Coursera Inc - Series B Preferred Stock - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2014
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Share purchase (in shares)     1,020,000  
Payment to acquire investment     $ 5,000  
Gain on sale of investment $ 6,100 $ 6,473    
Fair value of an investment       $ 11,473