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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
Note 2: Fair Value of Financial Instruments
The estimated fair values of financial instruments outstanding were (in thousands):
 
  
June 30, 2019
 
     
Unrealized
  
Unrealized
  
Fair
 
  
Cost
  
Gains
  
Losses
  
Value
 
Cash and cash equivalents
 $6,372  $—    $—    $6,372 
Short-term investments
  1,071   1   —     1,072 
  
 
 
  
 
 
  
 
 
  
 
 
 
  $7,443  $1  $—    $7,444 
  
 
 
  
 
 
  
 
 
  
 
 
 
  
  
December 31, 2018
 
     
Unrealized
  
Unrealized
  
Fair
 
  
Cost
  
Gains
  
Losses
  
Value
 
Cash and cash equivalents
 $7,104  $—    $—    $7,104 
  
 
 
  
 
 
  
 
 
  
 
 
 
The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) (in thousands):
 
  
June 30, 2019
 
  
Fair Value
  
Level 1
  
Level 2
  
Level 3
 
Money market funds
 $3,755  $3,755  $—    $—   
Corporate notes and commercial paper
 $1,072  $—    $1,072  $—   
  
  
December 31, 2018
 
  
Fair Value
  
Level 1
  
Level 2
  
Level 3
 
Money market funds
 $632  $632  $—    $—   
There were no transfers in or out of Level 1 and Level 2 securities during the three or six months ended June 30, 2019 or 2018.