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6. Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of minimum operating lease payments
Fiscal year ending December 31,        
(In thousands)        
  2019     $ 824  
  2020       435  
  2021       334  
  2022       349  
  2023       364  
  Thereafter       218  
        $ 2,524