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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Schedule of Cash and Cash Equivalents
 
  
2020
 
  
2019
 
Checking and saving accounts
  
$
99,286
 
  
$
118,367
 
Time deposits of no more than ninety days
  
 
19,500
 
  
 
40,000
 
Cash on hand
  
 
279
 
  
 
365
 
 
  
 
 
 
  
 
 
 
 
  
$
119,065
 
  
$
158,732