Fair value measurement (Tables)

6 Months Ended

Jun. 30, 2020

Fair value measurement

Schedule of assets and liabilities measured at fair value on recurring basis

	Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total		Classification in Consolidated balance sheets
		(in thousands)
At December 31, 2019
Assets:
Cash, cash equivalents and restricted cash	$	380,726	$	—	$	—	$	380,726	Cash and cash equivalents; restricted cash
Total assets	$	380,726	$	—	$	—	$	380,726
Liabilities:
Derivative financial instruments - related party		—		—		3,075		3,075
Total liabilities	$	—	$	—	$	3,075	$	3,075
At June 30, 2020
Assets:
Cash, cash equivalents and restricted cash	$	316,948	$	—	$	—	$	316,948	Cash and cash equivalents; restricted cash
Total assets	$	316,948	$	—	$	—	$	316,948
Liabilities:
Derivative financial instruments - related party	$	—	$	—	$	832	$	832
Total liabilities	$	—	$	—	$	832	$	832

Schedule of changes in Level 3 items

	Derivative
	financial
	instruments
	(in thousands)
Balance at December 31, 2019	$	3,075
Net gains recognized in profit or loss		(2,206)
Currency translation effects		(37)
Balance at June 30, 2020	$	832