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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Measurements  
Summary of the valuation of financial instrument pricing levels

 

 

Total

 

Level 1

 

Level 2

 

Level 3

 

June 30, 2017

 

 

 

 

 

 

 

 

 

Available-for-sale securities

 

$
994,000

 

$
994,000

 

$

—

 

$

—

 

 

 

 

 

 

 

 

 

 

 

December 31, 2016

 

 

 

 

 

 

 

 

 

Available-for-sale securities

 

$
932,000

 

$
932,000

 

$

—

 

$

—