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Summary of significant accounting policies (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents
Three Months Ended
March 31, 2022		Three Months Ended
March 31, 2021
(in thousands)Beginning
of period		End
of period		Beginning
of period		End
of period
Cash and cash equivalents$177,947 $230,057 $255,094 $228,430 
Restricted cash included in other assets, noncurrent478 478 321 321 
Total cash, cash equivalents and restricted cash per statement of cash flows$178,425 $230,535 $255,415 $228,751 
Schedule of Restricted Cash
Three Months Ended
March 31, 2022		Three Months Ended
March 31, 2021
(in thousands)Beginning
of period		End
of period		Beginning
of period		End
of period
Cash and cash equivalents$177,947 $230,057 $255,094 $228,430 
Restricted cash included in other assets, noncurrent478 478 321 321 
Total cash, cash equivalents and restricted cash per statement of cash flows$178,425 $230,535 $255,415 $228,751