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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash (Tables)
 3 Months Ended
Mar. 31, 2020
Cash, Cash Equivalents, and Short-term Investments [Abstract]  
Schedule of cash, cash equivalents and marketable securities
Cash, cash equivalents and marketable securities are classified as current unless mentioned otherwise below and consisted of the following:
 As of March 31, 2020
(in thousands)CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
Cash and cash equivalents$123,231  $—  $—  $123,231  
Corporate debt securities107,152  65  (119) 107,098  
Commercial paper35,248  100  —  35,348  
Asset-backed securities68,812  25  (42) 68,795  
U.S. government agency bonds4,000  —  —  4,000  
Money market350  —  —  350  
Certificates of deposit51  —  —  51  
$338,844  $190  $(161) $338,873  
Included in cash and cash equivalents$123,231  $—  $—  $123,231  
Included in marketable securities215,613  190  (161) 215,642  
Total cash, cash equivalents, and marketable securities$338,844  $190  $(161) $338,873  

 As of December 31, 2019
(in thousands)CostGross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
Cash and cash equivalents$142,837  $—  $—  $142,837  
Corporate debt securities145,875  121  (5) 145,991  
Commercial paper73,659  53  (2) 73,710  
Asset-backed securities77,731  79  —  77,810  
U.S. government agency bonds11,999  2  (10) 11,991  
Money market350  —  —  350  
Certificates of deposit51  —  —  51  
$452,502  $255  $(17) $452,740  
Included in cash and cash equivalents$142,837  $—  $—  $142,837  
Included in marketable securities(1)
309,665  255  (17) 309,903
Total cash, cash equivalents, and marketable securities$452,502  $255  $(17) $452,740  
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(1) As of December 31, 2019, $9.5 million of marketable securities have maturity dates greater than 12 months and are available to convert into cash, if needed.
Schedule of cash, cash equivalents, and restricted cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows.
(in thousands)March 31, 2020March 31, 2019
Cash and cash equivalents$123,231  $96,349  
Restricted cash2,662  2,579  
Cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows$125,893  $98,928