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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Additional Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Cash, Money Market Funds, and Marketable Securities      
Cash and cash equivalents $ 176,538,000 $ 163,240,000 $ 164,573,000
Available-for-sale debt securities 206,530,000 320,029,000  
Realized gain (loss) on debt securities 0 0  
Fair value, available-for-sale debt securities 206,530,000 320,029,000  
Fair value of available-for-sale debt securities in unrealized loss positions 17,200,000 $ 124,900,000  
Marketable Securities      
Cash, Money Market Funds, and Marketable Securities      
Available-for-sale debt securities 206,500,000    
Fair value, available-for-sale debt securities $ 206,500,000