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Cash and Cash Equivalents, Short-term Investments and Restricted Cash
 3 Months Ended
Mar. 31, 2020
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents, Short-term Investments and Restricted Cash Cash and Cash Equivalents, Short-term Investments and Restricted CashThe following tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, available-for-sale investments and restricted cash as of the dates presented (in thousands):
 March 31, 2020
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$202,182  $—  $—  $202,182  
Cash equivalents:
Money market funds1,356,139  —  —  1,356,139  
Commercial paper9,389  —  —  9,389  
Short-term investments:
U.S. government agency securities709,163  4,418  —  713,581  
Commercial paper103,646  —  —  103,646  
Treasury bills82,485  93  —  82,578  
Corporate notes and bonds69,348  21  (104) 69,265  
Municipal securities23,176  31  (15) 23,192  
Certificates of deposit996  —  —  996  
Restricted cash56,428  —  —  56,428  
        Total$2,612,952  $4,563  $(119) $2,617,396  

 December 31, 2019
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$194,955  $—  $—  $194,955  
Cash equivalents:
Money market funds872,431  —  —  872,431  
U.S. government agency securities35,011  —  (2) 35,009  
Commercial paper31,113  —  —  31,113  
Treasury bills6,441  —  —  6,441  
Corporate notes and bonds1,065  —  —  1,065  
Certificates of deposit249  —  —  249  
Short-term investments:
U.S. government agency securities861,862  365  (73) 862,154  
Corporate notes and bonds159,382  91  (42) 159,431  
Commercial paper150,267  —  —  150,267  
Treasury bills79,989  14  —  80,003  
Municipal securities27,836  56  (3) 27,889  
Certificates of deposit1,245  —  —  1,245  
Restricted cash89,646  —  —  89,646  
Total$2,511,492  $526  $(120) $2,511,898  
All available-for-sale investments as of March 31, 2020 have a contractual maturity date of one year or less.