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Intangible asset, net
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible asset, net
5. Intangible asset, net
 
(in thousands)
  
DECEMBER 31,
2019
 
 
DECEMBER 31,
2018
 
Cost
  $659 
 
$
 —
 
Accumulated amortization
   (92) 
 
 
 
—
 
  
 
 
 
 
 
 
 
Net intangible asset
  $567 
 
$
—