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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
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 at June 30,

2018

 

Equity Mutual Fund (Marketable securities)

 

$

3,822

 

 

$

—

 

 

$

—

 

 

$

3,822

 

U.S. Treasury Mutual Fund (Marketable securities)

 

 

—

 

 

 

11,842

 

 

 

—

 

 

 

11,842

 

 

 

$

3,822

 

 

$

11,842

 

 

$

—

 

 

$

15,664

 

 

 

 

Level 1

 

 

Level 2

 

 

Level 3

 

 

Total at December 31, 2017

 

Equity Mutual Fund (Marketable securities)

 

$

3,803

 

 

$

—

 

 

$

—

 

 

$

3,803

 

U.S. Treasury securities (Cash and cash equivalents)

 

 

11,866

 

 

 

—

 

 

 

—

 

 

 

11,866

 

 

 

$

15,669

 

 

$

—

 

 

$

—

 

 

$

15,669