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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Estimated Fair Values of Remaining Financial Instruments
The following table provides the estimated fair values of the remaining financial instruments:
 
 
As of June 30, 2017
 
As of December 31, 2016
(in thousands)
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Financial Instruments:
 
 
 
 
 
 
 
 
Cost method investment (1)
 
$
1,016

 
$
1,016

 
$
1,016

 
$
1,016

Highview technology license payable
 
$
210

 
$
210

 
$
207

 
$
207



(1) Fair value is based on the investee's recently completed equity raise at £2.00 per share. Refer to Note 3 for further discussion of this investment. The fair value measurement represents a Level 3 measurement as it is based on significant inputs not observable in the market.