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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Expense
Stock-based compensation expense was recognized in the Consolidated Statements of Operations as follows:   
   
Three months ended June 30,
 
Six months ended June 30,
   
2019
 
2018
 
2019
 
2018
 
(Unaudited - In thousands)
General and administrative expense
$
269

 
$
332

 
$
686

 
$
610

   
$
269

 
$
332

 
$
686

 
$
610