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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 30,
   
2019
 
2018
 
2019
 
2018
 
(Unaudited - In thousands)
General and administrative expense
$
248

 
$
243

 
$
934

 
$
853

   
$
248

 
$
243

 
$
934

 
$
853