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SHORT-TERM INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of Available-for-Sale Securities
The following table summarizes the available-for-sale securities held at March 31, 2018 and December 31, 2017 (in thousands):
As of March 31, 2018
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Corporate debt
$
13,991

 
$
—

 
$
(18
)
 
$
13,973

Total
$
13,991

 
$
—

 
$
(18
)
 
$
13,973

 
 
 
 
 
 
 
 
As of December 31, 2017
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Corporate debt
$
14,509

 
$
—

 
$
(8
)
 
$
14,501

Total
$
14,509

 
$
—

 
$
(8
)
 
$
14,501