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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Assets measured at fair value on recurring basis

Assets measured at fair value on a recurring basis are summarized below.

 

(in thousands)

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total

December 31,

2017

 

Marketable Securities (equity securities)

 

$

3,803

 

 

$

—

 

 

$

—

 

 

$

3,803

 

U.S. Treasury securities (cash equivalents)

 

$

11,866

 

 

$

—

 

 

$

—

 

 

$

11,866

 

 

(in thousands)

 

(Level 1)

 

 

(Level 2)

 

 

(Level 3)

 

 

Total

December 31,

2016

 

Marketable Securities (equity securities)

 

$

2,770

 

 

$

—

 

 

$

—

 

 

$

2,770

 

U.S. Treasury securities (cash equivalents)

 

$

1,002

 

 

$

—

 

 

$

—

 

 

$

1,002