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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of estimated fair values of financial instruments outstanding
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 
  
 
 
  
 
 
  
 
 
  
 
 
 
Schedule of fair value hierarchy for financial assets (cash equivalents and investments)
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.