Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Investments in Debt and Marketable Equity Securities Disclosure (Details)

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Financial Instruments - Investments in Debt and Marketable Equity Securities Disclosure (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Cost or Amortized Cost        
Cash and cash equivalents, at carrying value $ 379,922 $ 591,003 $ 735,387  
Restricted cash 28,279 127,278 52,295  
Cash, Cash Equivalents, and Restricted Cash        
Total cash, cash equivalents, and restricted cash 408,201 718,281 $ 787,682 $ 945,820
Short-term Investments        
Short-term Investments 82,506 33,737    
Fair Value, Measurements, Recurring        
Cost or Amortized Cost        
Restricted cash 28,279 127,278    
Cash, cash equivalents, and available-for-sale debt securities, amortized cost 544,672 802,430    
Unrealized Gains (Losses)        
Unrealized Gains 31 4,620    
Unrealized Losses (1,007) (204)    
Estimated Fair Value        
Cash equivalents 310,069 509,971    
Cash, cash equivalents, and available-for-sale debt securities 543,696 806,846    
Cash, Cash Equivalents, and Restricted Cash        
Total cash, cash equivalents, and restricted cash 408,201 718,281    
Short-term Investments        
Short-term Investments 82,506 33,737    
Long-term Investments        
Long-term investments 52,989 54,828    
U.S. treasury securities | Fair Value, Measurements, Recurring        
Cost or Amortized Cost        
Debt securities, available for sale, estimated fair value 124,003 71,546    
Unrealized Gains (Losses)        
Unrealized Gains 30 1    
Unrealized Losses (1,000) (204)    
Estimated Fair Value        
Debt securities, available-for-sale, amortized cost 124,973 71,749    
Short-term Investments        
Short-term Investments 71,014 16,718    
Long-term Investments        
Long-term investments 52,989 54,828    
Agency bonds | Fair Value, Measurements, Recurring        
Cost or Amortized Cost        
Debt securities, available for sale, estimated fair value 19,081 11,906    
Unrealized Gains (Losses)        
Unrealized Gains 1 6    
Unrealized Losses (7) 0    
Estimated Fair Value        
Debt securities, available-for-sale, amortized cost 19,087 11,900    
Cash, Cash Equivalents, and Restricted Cash        
Total cash, cash equivalents, and restricted cash 7,589      
Short-term Investments        
Short-term Investments 11,492 11,906    
Long-term Investments        
Long-term investments 0 0    
Equity securities        
Cost or Amortized Cost        
Debt securities, available for sale, estimated fair value   5,113    
Unrealized Gains (Losses)        
Unrealized Gains   4,613    
Unrealized Losses   0    
Estimated Fair Value        
Debt securities, available-for-sale, amortized cost   500    
Short-term Investments        
Short-term Investments   5,113    
Equity securities | Fair Value, Measurements, Recurring        
Short-term Investments        
Short-term Investments   5,113    
Long-term Investments        
Long-term investments   0    
Cash | Fair Value, Measurements, Recurring        
Cost or Amortized Cost        
Cash and cash equivalents, at carrying value 69,853 81,032    
Estimated Fair Value        
Cash equivalents 69,853 81,032    
Cash, Cash Equivalents, and Restricted Cash        
Total cash, cash equivalents, and restricted cash 69,853 81,032    
Money markets funds | Fair Value, Measurements, Recurring        
Cost or Amortized Cost        
Cash and cash equivalents, at carrying value 302,480 509,971    
Estimated Fair Value        
Cash equivalents 302,480 509,971    
Cash, Cash Equivalents, and Restricted Cash        
Total cash, cash equivalents, and restricted cash $ 302,480 $ 509,971