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Cash and cash equivalents
6 Months Ended
Jun. 30, 2019
Cash and Cash Equivalents [Abstract]  
Cash and cash equivalents
3. Cash and cash equivalents
(in thousands)
 
JUNE 30,

2019
 
 
DECEMBER 31,

2018
 
Cash
 
$
23,032
 
 
$
25,061
 
Cash equivalents
 
 
49,668
 
 
 
51,867
 
 
 
$
72,700
 
 
$
76,928