Marketable Securities

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Marketable Securities

6. Marketable Securities

We report our investments as current assets in our unaudited Condensed Consolidated Balance Sheets in “Marketable securities,” representing the investment of cash available for current operations. See Note 7.  

Our investments in marketable securities are classified as available for sale and are summarized as follows (in thousands):

	June 30, 2019
	Amortized Cost		Unrealized Gain		Market Value
U.S. Treasury bills (due within one year)	$	149,935	$	10	$	149,945

	December 31, 2018
	Amortized Cost		Unrealized Gain		Market Value
U.S. Treasury bills (due within one year)	$	299,813	$	36	$	299,849