XML 76 R21.htm IDEA: XBRL DOCUMENT v3.19.3
Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities
Marketable securities at September 30, 2019 consisted of the following (in thousands):
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Current:
U.S. Treasuries$160,981  $122  $(32) $161,071  
Government securities58,093  15  (47) 58,061  
Corporate debt securities150,851  241  (36) 151,056  
Non-current:
Government securities21,594  15  (24) 21,585  
Corporate debt securities66,672  347  (25) 66,994  
Total marketable securities$458,191  $740  $(164) $458,767  
Marketable securities at December 31, 2018 consisted of the following (in thousands):
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
Current:
Certificates of deposit$960  $—  $(4) $956  
U.S. Treasuries231,101  7  (228) 230,880  
Government securities75,335  —  (121) 75,214  
Corporate debt securities208,233  —  (483) 207,750  
Non-current:
U.S. Treasuries12,202  4  (125) 12,081  
Government securities70,177  10  (188) 69,999  
Corporate debt securities139,082  12  (1,055) 138,039  
Total marketable securities$737,090  $33  $(2,204) $734,919