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Restricted cash (Tables)
 12 Months Ended
Dec. 31, 2018
Restricted Cash [Abstract]  
Summary of Restricted Cash
 
December 31, 2018

 
December 31, 2017

Current:
 
 
 
Restricted cash deposits - Greece
$
296

 
$
310

 
296

 
310

Non-current:
 
 
 
Restricted credit card deposits
58

 
43

Restricted cash related to Letter of Guarantee - Greece
10,670

 
9,743

Environmental guarantee deposits
2,721

 
2,831

 
$
13,449

 
$
12,617