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Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Marketable Securities [Abstract]  
Amortized Cost And Fair Value Of Marketable Securities



 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2017

 

 

Amortized Cost

 

 

Gross Unrealized Gains

 

 

Gross Unrealized Losses

 

 

Fair Value

 



 

 

 

 

 

 

 

 

 

 

 

 

 

Corporate bonds

 

$

 140,969 

 

$

 96 

 

$

 (179)

 

$

 140,886 

 

Certificates of deposit

 

 

 58,510 

 

 

 -

 

 

 -

 

 

 58,510 

 

Commercial paper

 

 

 29,171 

 

 

 -

 

 

 -

 

 

 29,171 

 

Asset backed securities

 

 

 22,206 

 

 

 4 

 

 

 (43)

 

 

 22,167 

 

U.S. government bonds

 

 

 15,619 

 

 

 11 

 

 

 (19)

 

 

 15,611 

 

Agency bonds

 

 

 10,990 

 

 

 9 

 

 

 (52)

 

 

 10,947 

 

Treasury bills

 

 

 6,964 

 

 

 -

 

 

 (1)

 

 

 6,963 

 

Total marketable securities

 

$

 284,429 

 

$

 120 

 

$

 (294)

 

$

 284,255