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Financial Instruments - Investments in Debt and Marketable Equity Securities Disclosure (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cost or Amortized Cost    
Cash and cash equivalents, at carrying value $ 234,679 $ 432,608
Restricted cash 12,769 6,446
Cash, cash equivalents, and available-for-sale debt securities, amortized cost 348,446 439,054
Unrealized Gains (Losses)    
Unrealized Gains 31  
Unrealized Losses (22)  
Estimated Fair Value    
Restricted cash 12,769 6,446
Cash, cash equivalents, and available-for-sale debt securities 348,455 439,054
Short-term Investments    
Short-term investments 70,029  
Long-term Investments    
Long-term investments 30,978  
Cash    
Cost or Amortized Cost    
Cash and cash equivalents, at carrying value 13,237 6,832
Estimated Fair Value    
Cash and cash equivalents, fair value disclosure 13,237 6,832
Level 1 | U.S. treasury securities    
Cost or Amortized Cost    
Debt securities, available-for-sale, amortized cost 100,998  
Unrealized Gains (Losses)    
Unrealized Gains 31  
Unrealized Losses (22)  
Estimated Fair Value    
Debt securities, available-for-sale 101,007  
Short-term Investments    
Short-term investments 70,029  
Long-term Investments    
Long-term investments 30,978  
Level 1 | Money markets funds    
Cost or Amortized Cost    
Cash and cash equivalents, at carrying value $ 221,442 425,776
Estimated Fair Value    
Cash and cash equivalents, fair value disclosure   $ 425,776