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Fair Value Measurements - Summary of Fair Values (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Available-for-Sale Investments   $ 0
Liabilities:    
Common Stock Warrants $ 6,293,000 178,232,000
Fair Value, Recurring    
Assets:    
Available-for-Sale Investments 528,902,000  
Liabilities:    
Total liabilities 6,293,000 178,232,000
Fair Value, Recurring | Asset backed securities    
Assets:    
Available-for-Sale Investments 111,552,000  
Fair Value, Recurring | Certificates of deposits    
Assets:    
Available-for-Sale Investments 6,002,000  
Fair Value, Recurring | Corporate notes and bonds    
Assets:    
Available-for-Sale Investments 206,989,000  
Fair Value, Recurring | Commercial paper    
Assets:    
Available-for-Sale Investments 109,391,000  
Fair Value, Recurring | Foreign government securities    
Assets:    
Available-for-Sale Investments 8,181,000  
Fair Value, Recurring | US Government Securities    
Assets:    
Available-for-Sale Investments 86,787,000  
Level 1 | Fair Value, Recurring    
Assets:    
Available-for-Sale Investments 86,787,000  
Liabilities:    
Total liabilities 0 124,545,000
Level 1 | Fair Value, Recurring | Asset backed securities    
Assets:    
Available-for-Sale Investments 0  
Level 1 | Fair Value, Recurring | Certificates of deposits    
Assets:    
Available-for-Sale Investments 0  
Level 1 | Fair Value, Recurring | Corporate notes and bonds    
Assets:    
Available-for-Sale Investments 0  
Level 1 | Fair Value, Recurring | Commercial paper    
Assets:    
Available-for-Sale Investments 0  
Level 1 | Fair Value, Recurring | Foreign government securities    
Assets:    
Available-for-Sale Investments 0  
Level 1 | Fair Value, Recurring | US Government Securities    
Assets:    
Available-for-Sale Investments 86,787,000  
Level 2 | Fair Value, Recurring    
Assets:    
Available-for-Sale Investments 442,114,000  
Liabilities:    
Total liabilities 0 0
Level 2 | Fair Value, Recurring | Asset backed securities    
Assets:    
Available-for-Sale Investments 111,552,000  
Level 2 | Fair Value, Recurring | Certificates of deposits    
Assets:    
Available-for-Sale Investments 6,002,000  
Level 2 | Fair Value, Recurring | Corporate notes and bonds    
Assets:    
Available-for-Sale Investments 206,989,000  
Level 2 | Fair Value, Recurring | Commercial paper    
Assets:    
Available-for-Sale Investments 109,391,000  
Level 2 | Fair Value, Recurring | Foreign government securities    
Assets:    
Available-for-Sale Investments 8,181,000  
Level 2 | Fair Value, Recurring | US Government Securities    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring    
Assets:    
Available-for-Sale Investments 0  
Liabilities:    
Total liabilities 6,293,000 53,687,000
Level 3 | Fair Value, Recurring | Asset backed securities    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring | Certificates of deposits    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring | Corporate notes and bonds    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring | Commercial paper    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring | Foreign government securities    
Assets:    
Available-for-Sale Investments 0  
Level 3 | Fair Value, Recurring | US Government Securities    
Assets:    
Available-for-Sale Investments 0  
Public Common Stock Warrants | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 124,545,000
Public Common Stock Warrants | Level 1 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 124,545,000
Public Common Stock Warrants | Level 2 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 0
Public Common Stock Warrants | Level 3 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 0
Private Common Stock Warrants | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 6,293,000 53,687,000
Private Common Stock Warrants | Level 1 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 0
Private Common Stock Warrants | Level 2 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants 0 0
Private Common Stock Warrants | Level 3 | Fair Value, Recurring    
Liabilities:    
Common Stock Warrants $ 6,293,000 $ 53,687,000