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Cash Equivalents and Investments (Tables)
12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities The following table is a summary of amortized cost, unrealized gain and loss, and fair value:
 
December 31, 2018
 
December 31, 2017
 
Cost
 
Unrealized
 
Fair Value
 
Cost
 
Unrealized
 
Fair Value
(in thousands)
 
Gains
 
Losses
 
 
 
Gains
 
Losses
 
Money market funds
$
38,354

 
$

 
$

 
$
38,354

 
$
236,744

 
$

 
$

 
$
236,744

U.S. treasury securities
80,844

 
5

 
(5
)
 
80,844

 

 

 

 

U.S. government agency obligations
52,586

 

 
(8
)
 
52,578

 

 

 

 

Total cash equivalents and available-for-sale securities
$
171,784

 
$
5

 
$
(13
)
 
$
171,776

 
$
236,744

 
$

 
$

 
$
236,744

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Classified as:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents
 
 
 
 
 
 
$
69,220

 
 
 
 
 
 
 
$
236,744

Short-term investments
 
 
 
 
 
 
102,556

 
 
 
 
 
 
 

Total cash equivalents and available-for-sale securities
 
 
 
 
 
 
$
171,776

 
 
 
 
 
 
 
$
236,744