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Employee Benefit Plan (Tables)
12 Months Ended
Dec. 31, 2017
Postemployment Benefits [Abstract]  
Details of Company Contribution to Plan
 
Year ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Company contribution to 401 (k) plan
$
259

 
$
172

 
$
127