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SHORT-TERM INVESTMENTS
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
SHORT-TERM INVESTMENTS
SHORT-TERM INVESTMENTS
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


All available-for-sale securities held at March 31, 2018 and December 31, 2017 had maturities of less than one year. Unrealized gains and losses on available-for-sale securities are included as a component of other comprehensive loss. The securities in unrealized loss positions have not been in a continuous unrealized loss position for 12 months or longer. The Company does not intend to sell the investments and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. The Company reviews its investments to identify and evaluate investments that have an indication of possible other-than-temporary impairment. Factors considered in determining whether a loss is other-than-temporary include the length of time and extent to which fair value has been less than the cost basis, the financial condition and near-term prospects of the investee, and the Company’s intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value. During the three months ended March 31, 2018 and 2017, respectively, the Company did not recognize any impairment or gains or losses on sales of available-for-sale securities.