Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounting Policies [Abstract]          
Unrealized loss on available for sale securities $ 64,000 $ 0 $ 62,000    
Unrealized loss on equity securities (28,965,000) 0 $ (28,965,000) $ 0  
Stated term     1 year    
Renewal option term     1 year    
Term for students     2 years    
Deferred revenue 2,780,000   $ 2,780,000   $ 1,922,000,000
Stock based compensation $ 2,100,000 $ 300,000 $ 7,149,000 $ 685,000