Summary of Accounting policies - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disposal Transactions Closing in October 2019 [Abstract]
Number of Disposal Transactions	4	4
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts Receivable, Allowance for Credit Losses, Current, Disclosure	$ 4,130	$ 4,130	$ 1,337
Provision for Other Credit Losses		2,810
Accounts Receivable, Allowance for Credit Loss, Recovery		577
Allowance for Loan and Lease Losses, Write-offs		$ (594)