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FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis
The following tables summarize the Company’s financial instruments measured at fair value on a recurring basis (in thousands):

TOTAL
 
LEVEL 1
 
LEVEL 2
 
LEVEL 3
March 31, 2018
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Money market funds
$
6,038

 
$
6,038

 
$
—

 
$
—

U.S. Treasury reverse repurchase agreements
46,000

 
—

 
46,000

 
—

Corporate debt
13,973

 
—

 
13,973

 


Total assets at fair value
$
66,011

 
$
6,038

 
$
59,973

 
$
—

December 31, 2017
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Money market funds
$
11,556

 
$
11,556

 
$
—

 
$
—

U.S. Treasury reverse repurchase agreements
48,000

 
—

 
48,000

 
—

Corporate debt
15,101

 
—

 
15,101

 
—

Total assets at fair value
$
74,657

 
$
11,556

 
$
63,101

 
$
—