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Fair Value of Financial Instruments
 3 Months Ended
Mar. 31, 2018
Fair Value of Financial Instruments [Abstract]  
Fair Value of Financial Instruments
5. Fair Value of Financial Instruments

Items measured at fair value on a recurring basis are short-term investments. The following table sets forth the Company’s financial instruments that were measured at fair value on a recurring basis by level within the fair value hierarchy:

  
Fair Value Measurements as of
March 31, 2018 Using:
 
  
Level 1
  
Level 2
  
Level 3
  
Total
 
Assets:
            
Money market mutual funds (included in cash and cash equivalents)
 
$
79,910
  
$
-
  
$
-
  
$
79,910
 
                 
Certificates of deposit
 
$
1,546
  
$
-
  
$
-
  
$
1,546
 
United States Treasury securities
  
10,015
   
-
   
-
   
10,015
 
Short-term investments
  
11,561
   
-
   
-
   
11,561
 
                 
  
$
91,471
  
$
-
  
$
-
  
$
91,471
 
 
The Company classifies its money market mutual funds as Level 1 assets under the fair value hierarchy, as these assets have been valued using quoted market prices in active markets without any valuation adjustment.