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Fair Value Measurement
12 Months Ended
Dec. 31, 2018
Fair Value Measurement [Abstract]  
Fair Value Measurement
Note 12 − Fair Value Measurement

We apply fair value accounting for all financial assets and liabilities and non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a recurring basis. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement:

Level 1 – Quoted prices in active markets for identical assets or liabilities.

Level 2 – Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 – Inputs that are generally unobservable and typically reflect management’s estimate of assumptions that market participants would use in pricing the asset or liability.

The carrying amounts for cash and cash equivalents, investments in certificates of deposit, accounts payable and accrued expenses approximate their fair values due to the short period of time until maturity.

Mutual funds: Valued at the quoted net asset value (NAV) of shares held.

U.S. agency securities: Fair value measured at the closing price reported on the active market on which the individual securities are traded.

The following table shows our cash and available-for-sale securities adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents of investments available for sale as of December 31, 2018 and 2017 (in thousands):

  
December 31, 2018
 
  
Adjusted
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Fair
Value
  
Cash
and Cash
Equivalents
  
Investments
Available
for Sale
 
Cash
 
$
5,048
  
$
  
$
  
$
5,048
  
$
5,048
  
$
 
Level 1:
                        
Mutual funds
  
1,107
  
   
   
1,107
   
1,107
   
 
U.S. agency securities
  
3,259
  
   
   
3,259
   
1,456
   
1,803
 
   
4,366
  
   
   
4,366
   
2,563
   
1,803
 
Total
 
$
9,414
  
$
  
$
  
$
9,414
  
$
7,611
  
$
1,803
 

  
December 31, 2017
 
  
Adjusted
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Fair
Value
  
Cash
and Cash
Equivalents
  
Investments
Available
for Sale
 
Cash
 
$
1,972
  
$
  
$
  
$
1,972
  
$
1,972
  
$
 
Level 1:
                        
Mutual funds
  
616
  
$
   
   
616
   
616
   
 
U.S. agency securities
  
2,001
  
$
   
(1
)
  
2,000
   
547
   
1,453
 
   
2,617
  
$
   
(1
)
  
2,616
   
1,163
   
1,453
 
Total
 
$
4,589
  
$
  
$
(1
)
 
$
4,588
  
$
3,135
  
$
1,453
 

The maturities of our marketable securities generally range from within one to two years. Actual maturities could differ from contractual maturities due to call or prepayment provisions.