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Short-term investments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Debt Securities, Available-for-Sale [Table Text Block]
Below is a summary of short-term investments, which are measured at fair value as of June 30, 2022 (in thousands):
 
    
Amortized
Cost
     
Gross
Unrealized
Gains
     
Gross
Unrealized
Losses
     
Fair Value
  
                                 
                                 
Corporate bonds
  
$
173,376
 
  
$
—  
 
  
$
(2,326
)

  
$
171,050

  
Asset-backed securities
      20,449        —          (86 )       20,363  
Government securities
      2,951        —          (17 )       2,934  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
  
$
196,776
 
  
$
 
—  
 
  
$
(2,429
)
 		  
$
194,347