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Marketable Securities
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities Marketable Securities
Our marketable securities are classified as available-for-sale pursuant to ASC 320, Investments – Debt and Equity Securities, and are recorded at fair value, with unrealized gains and losses included as a component of accumulated other comprehensive income (loss) in the condensed consolidated balance sheets and statements of stockholders’ equity and a component of total comprehensive loss in the condensed consolidated statements of comprehensive loss, until realized. Realized gains and losses are included in investment income on a specific-identification basis. There were no material realized gains or losses on marketable securities for the three and nine months ended September 30, 2019 and 2018.
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  
As of September 30, 2019 and December 31, 2018, we held both current and non-current investments. Investments classified as current have maturities of less than one year. Investments classified as non-current are those that: (i) have a maturity of greater than one year, and (ii) we do not intend to liquidate within the next twelve months, although these funds are available for use and, therefore, are classified as available-for-sale.
As of September 30, 2019 and December 31, 2018, we held 68 and 242 debt securities, respectively, that were in an unrealized loss position for less than one year. The aggregate fair value of debt securities in an unrealized loss position at September 30, 2019 and December 31, 2018 was $159.8 million and $639.3 million, respectively. There were no individual securities that were in a significant unrealized loss position as of September 30, 2019 and December 31, 2018. Given our intent and ability to hold such securities until recovery, and the lack of significant change in the credit risk of these investments, we do not consider these marketable securities to be other-than-temporarily impaired as of September 30, 2019 and December 31, 2018.