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Fair Value Measurements - Schedule of Financial Assets and Liabilities Subject to Fair Value Measurements on a Recurring Basis and the Level of Inputs Used (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 18, 2018
Aug. 31, 2017
Assets:          
Total marketable investments $ 552,896 $ 410,031 $ 25,803    
Equity investments 16,950 0      
Liabilities:          
Warrant liabilities 51,753 343,400 1,122    
2017 Warrants          
Liabilities:          
Warrant liabilities     1,035   $ 480
2018 Warrants          
Liabilities:          
Warrant liabilities     87 $ 46  
U.S. Treasury          
Assets:          
Total marketable investments 210,709 155,347 749    
U.S. agency and government sponsored securities          
Assets:          
Total marketable investments   19,996 1,398    
Corporate bonds          
Assets:          
Total marketable investments 61,672 45,450 3,473    
Asset-backed securities          
Assets:          
Total marketable investments 8,051 7,018      
Fair Value, Recurring          
Assets:          
Total cash equivalents 185,290 198,292 21,404    
Total marketable investments   276,710 6,659    
Equity investments 16,950        
Total marketable investments 403,591 276,710      
Liabilities:          
Warrant liabilities 51,753 343,400 1,122    
Fair Value, Recurring | Public Warrants          
Liabilities:          
Warrant liabilities 0 228,933      
Fair Value, Recurring | Private Warrants          
Liabilities:          
Warrant liabilities 51,753 114,467      
Fair Value, Recurring | 2017 Warrants          
Liabilities:          
Warrant liabilities     1,035    
Fair Value, Recurring | 2018 Warrants          
Liabilities:          
Warrant liabilities     87    
Fair Value, Recurring | U.S. Treasury          
Assets:          
Total marketable investments 210,709 130,348 749    
Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total marketable investments 0 19,996      
Fair Value, Recurring | Commercial paper          
Assets:          
Total marketable investments 106,209 73,898 3,212    
Fair Value, Recurring | Corporate bonds          
Assets:          
Total marketable investments 61,672 45,450 2,698    
Fair Value, Recurring | Asset-backed securities          
Assets:          
Total marketable investments 8,051 7,018      
Fair Value, Recurring | Money market funds          
Assets:          
Total cash equivalents 19,035 64,971 2,260    
Fair Value, Recurring | U.S. Treasury          
Assets:          
Total cash equivalents 0 24,999      
Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total cash equivalents     1,398    
Fair Value, Recurring | Commercial paper          
Assets:          
Total cash equivalents 166,255 108,322 16,971    
Fair Value, Recurring | Corporate bonds          
Assets:          
Total cash equivalents     775    
Level 1 | Fair Value, Recurring          
Assets:          
Total cash equivalents 19,035 89,970 2,260    
Total marketable investments   130,348 749    
Equity investments 16,950        
Total marketable investments 227,659 130,348      
Liabilities:          
Warrant liabilities 0 228,933 0    
Level 1 | Fair Value, Recurring | Public Warrants          
Liabilities:          
Warrant liabilities 0 228,933      
Level 1 | Fair Value, Recurring | Private Warrants          
Liabilities:          
Warrant liabilities 0 0      
Level 1 | Fair Value, Recurring | 2017 Warrants          
Liabilities:          
Warrant liabilities     0    
Level 1 | Fair Value, Recurring | 2018 Warrants          
Liabilities:          
Warrant liabilities     0    
Level 1 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total marketable investments 210,709 130,348 749    
Level 1 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total marketable investments 0 0      
Level 1 | Fair Value, Recurring | Commercial paper          
Assets:          
Total marketable investments 0 0 0    
Level 1 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total marketable investments 0 0 0    
Level 1 | Fair Value, Recurring | Asset-backed securities          
Assets:          
Total marketable investments 0 0      
Level 1 | Fair Value, Recurring | Money market funds          
Assets:          
Total cash equivalents 19,035 64,971 2,260    
Level 1 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total cash equivalents 0 24,999      
Level 1 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total cash equivalents     0    
Level 1 | Fair Value, Recurring | Commercial paper          
Assets:          
Total cash equivalents 0 0 0    
Level 1 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total cash equivalents     0    
Level 2 | Fair Value, Recurring          
Assets:          
Total cash equivalents 166,255 108,322 19,144    
Total marketable investments   146,362 5,910    
Equity investments 0        
Total marketable investments 175,932 146,362      
Liabilities:          
Warrant liabilities 0 114,467 0    
Level 2 | Fair Value, Recurring | Public Warrants          
Liabilities:          
Warrant liabilities 0 0      
Level 2 | Fair Value, Recurring | Private Warrants          
Liabilities:          
Warrant liabilities 0 114,467      
Level 2 | Fair Value, Recurring | 2017 Warrants          
Liabilities:          
Warrant liabilities     0    
Level 2 | Fair Value, Recurring | 2018 Warrants          
Liabilities:          
Warrant liabilities     0    
Level 2 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total marketable investments 0 0 0    
Level 2 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total marketable investments 0 19,996      
Level 2 | Fair Value, Recurring | Commercial paper          
Assets:          
Total marketable investments 106,209 73,898 3,212    
Level 2 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total marketable investments 61,672 45,450 2,698    
Level 2 | Fair Value, Recurring | Asset-backed securities          
Assets:          
Total marketable investments 8,051 7,018      
Level 2 | Fair Value, Recurring | Money market funds          
Assets:          
Total cash equivalents 0 0 0    
Level 2 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total cash equivalents 0 0      
Level 2 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total cash equivalents     1,398    
Level 2 | Fair Value, Recurring | Commercial paper          
Assets:          
Total cash equivalents 166,255 108,322 16,971    
Level 2 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total cash equivalents     775    
Level 3 | Fair Value, Recurring          
Assets:          
Total cash equivalents 0 0 0    
Total marketable investments   0 0    
Equity investments 0        
Total marketable investments 0 0      
Liabilities:          
Warrant liabilities 51,753 0 1,122    
Level 3 | Fair Value, Recurring | Public Warrants          
Liabilities:          
Warrant liabilities 0 0      
Level 3 | Fair Value, Recurring | Private Warrants          
Liabilities:          
Warrant liabilities 51,753 0      
Level 3 | Fair Value, Recurring | 2017 Warrants          
Liabilities:          
Warrant liabilities     1,035    
Level 3 | Fair Value, Recurring | 2018 Warrants          
Liabilities:          
Warrant liabilities     87    
Level 3 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total marketable investments 0 0 0    
Level 3 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total marketable investments 0 0      
Level 3 | Fair Value, Recurring | Commercial paper          
Assets:          
Total marketable investments 0 0 0    
Level 3 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total marketable investments 0 0 0    
Level 3 | Fair Value, Recurring | Asset-backed securities          
Assets:          
Total marketable investments 0 0      
Level 3 | Fair Value, Recurring | Money market funds          
Assets:          
Total cash equivalents 0 0 0    
Level 3 | Fair Value, Recurring | U.S. Treasury          
Assets:          
Total cash equivalents 0 0      
Level 3 | Fair Value, Recurring | U.S. agency and government sponsored securities          
Assets:          
Total cash equivalents     0    
Level 3 | Fair Value, Recurring | Commercial paper          
Assets:          
Total cash equivalents $ 0 $ 0 0    
Level 3 | Fair Value, Recurring | Corporate bonds          
Assets:          
Total cash equivalents     $ 0