Revenues and Accounts Receivable - Allowance for credit losses on accounts receivables (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Jun. 30, 2020
Revenues and Accounts Receivable
Balance at March 31, 2020	$ 1,541	$ 1,541
Adjusted balance at April 1, 2020	$ 1,541
Current period provision for expected credit losses		71
Write-offs charged against the allowance		(218)
Foreign currency translation adjustments		7
Balance at June 30, 2020		$ 1,401