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Cash and Cash Equivalents, Short-term Investments and Restricted Cash (Tables)
 6 Months Ended
Jun. 30, 2020
Cash and Cash Equivalents [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments
The 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):
 June 30, 2020
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$190,389  $—  $—  $190,389  
Cash equivalents:
Money market funds1,784,896  —  —  1,784,896  
Treasury bills70,189  —  —  70,189  
Short-term investments:
Treasury bills963,200  41  (10) 963,231  
U.S. government agency securities463,806  1,909  —  465,715  
Corporate notes and bonds30,094  119  —  30,213  
Municipal securities16,519  19  —  16,538  
Commercial paper14,972  —  —  14,972  
Certificates of deposit498  —  —  498  
Restricted cash33,620  —  —  33,620  
        Total$3,568,183  $2,088  $(10) $3,570,261  

 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