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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale and Trading Securities Reconciliation
The following tables summarize the Company's short-term investments (in thousands):
 
 
 
As of December 31, 2018
 
Maturity
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Estimated fair value
Corporate debt securities
1 year or less
 
$
111,933

 
$
26

 
$
(43
)
 
$
111,916

Commercial paper
1 year or less
 
74,433

 
—

 
(24
)
 
74,409

U.S. Treasury bills
1 year or less
 
3,771

 
—

 
—

 
3,771

 
 
 
$
190,137

 
$
26

 
$
(67
)
 
$
190,096


 
 
 
As of December 31, 2017
 
Maturity
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Estimated fair value
Corporate debt securities
1 year or less
 
$
24,264

 
$
—

 
$
(23
)
 
$
24,241

Commercial paper
1 year or less
 
18,912

 
—

 
(19
)
 
18,893

 
 
 
$
43,176

 
$
—

 
$
(42
)
 
$
43,134