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Cash and Cash Equivalents, Short-term Investments and Restricted Cash (Tables)
 12 Months Ended
Dec. 31, 2019
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):
 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  
 December 31, 2018
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Market
Value
Cash$105,484  $—  $—  $105,484  
Cash equivalents:
Money market funds541,575  —  —  541,575  
Commercial paper3,999  —  —  3,999  
Short-term investments:
U.S. government agency securities647,266  51  (821) 646,496  
Corporate notes and bonds113,109  1  (177) 112,933  
Commercial paper85,506  —  —  85,506  
Municipal securities39,316  23  (33) 39,306  
Foreign government securities14,929  —  (14) 14,915  
Certificates of deposit4,711  1  (1) 4,711  
Restricted cash12,385  —  —  12,385  
        Total$1,568,280  $76  $(1,046) $1,567,310  
Available-for-Sale Investments by Contractual Maturity
The following table presents available-for-sale investments by contractual maturity date as of December 31, 2019 (in thousands):
Amortized CostEstimated Fair Market Value
Due in one year or less$1,254,763  $1,255,186  
Due after one year through two years25,818  25,803  
Total$1,280,581  $1,280,989