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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value Hierarchy of Financial Assets Measured at Fair Value on Recurring Basis
The fair value hierarchy of Actua’s financial assets relating to continuing operations that are measured at fair value on a recurring basis were as follows:
(in thousands)
 
 
 
Valuation
 
 
 
 
 
 
 
 
 
 
technique
 
 
 
 
Asset
 
(approach)
 
Level 1
 
Level 2
 
Level 3
December 31, 2017
 
 
 
 
 
 
 
 
 
 
Cash equivalents (money market accounts)
 
$
333,662

 
Market
 
$
333,662

 
$
—

 
$
—

 
 
$
333,662

 
 
 
$
333,662


$
—


$
—

 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
Cash equivalents (money market accounts)
 
$
75,650

 
Market
 
$
75,650

 
$
—

 
$
—

 
 
$
75,650

 
 
 
$
75,650

 
$
—

 
$
—