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Cash and Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Cash and Cash Equivalents [Abstract]  
Schedule of Restricted Cash and Cash Equivalents
A reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the amount reported within the Consolidated Statements of Cash Flows is shown in the table below (in thousands):
December 31, 2019December 31, 2018December 31, 2017
Cash and cash equivalents$79,449  $77,123  $218,375  
Restricted cash included within prepaid expenses and other current assets
—  —  84  
Restricted cash included within other non-current assets
1,500  1,500  451  
Total cash, cash equivalents, and restricted cash$80,949  $78,623  $218,910  
Schedule of Cash and Cash Equivalents
A reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the amount reported within the Consolidated Statements of Cash Flows is shown in the table below (in thousands):
December 31, 2019December 31, 2018December 31, 2017
Cash and cash equivalents$79,449  $77,123  $218,375  
Restricted cash included within prepaid expenses and other current assets
—  —  84  
Restricted cash included within other non-current assets
1,500  1,500  451  
Total cash, cash equivalents, and restricted cash$80,949  $78,623  $218,910  
Summary of Available for Sale Securities The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s marketable securities by major security type at each balance sheet date are summarized in the tables below (in thousands):
December 31, 2019
Amortized
Cost
Unrealized Holding GainsUnrealized Holding LossesAggregate Fair Value
Short-term marketable securities:
U.S. government treasuries$249,478  $594  $(2) $250,070  
U.S. government agency securities1,999  1  —  2,000  
Corporate debt securities53,396  94  (11) 53,479  
Commercial paper30,358  —  —  30,358  
Total short-term marketable securities335,231  689  (13) 335,907  
Long-term marketable securities:
U.S. government treasuries13,865  6  (2) 13,869  
Corporate debt securities25,998  34  (15) 26,017  
Total long-term marketable securities39,863  40  (17) 39,886  
Total$375,094  $729  $(30) $375,793  

December 31, 2018
Amortized
Cost
Unrealized Holding GainsUnrealized Holding LossesAggregate Fair Value
Short-term marketable securities:
U.S. government treasuries$220,081  $29  $(356) $219,754  
U.S. government agency securities73,373  —  (222) 73,151  
Corporate debt securities71,940  1  (266) 71,675  
Commercial paper22,594  —  —  22,594  
Total short-term marketable securities387,988  30  (844) 387,174  
Long-term marketable securities:
U.S. government treasuries116,878  329  (76) 117,131  
U.S. government agency securities1,975  2  —  1,977  
Corporate debt securities28,864  8  (99) 28,773  
Total long-term marketable securities147,717  339  (175) 147,881  
Total$535,705  $369  $(1,019) $535,055