Fair value measurement (Tables)

9 Months Ended

Sep. 30, 2018

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, 2017
Assets:
Cash, cash equivalents and restricted cash	$	161,851	$	—	$	—	$	161,851
Total assets		161,851		—		—		161,851
Liabilities:
Derivative financial instruments - debt		—		—		337		337	Accrued expenses and other current liabilities
Derivative financial instruments - related party		—		—		1,298		1,298
Contingent consideration		—		—		3,964		3,964
Total liabilities	$	—	$	—	$	5,599	$	5,599
At September 30, 2018
Assets:
Cash, cash equivalents and restricted cash	$	242,000	$	—	$	—	$	242,000
Total assets		242,000		—		—		242,000
Liabilities:
Derivative financial instruments - debt		—		—		857		857	Accrued expenses and other current liabilities
Derivative financial instruments - related party		—		—		1,085		1,085
Contingent consideration		—		—		—		—
Total liabilities	$	—	$	—	$	1,942	$	1,942

Schedule of changes in Level 3 items

			Derivative
	Contingent		financial
	consideration		instruments		Total
	in thousands
Balance at December 31, 2017	$	3,964	$	1,635	$	5,599
(Gains) / losses recognized in profit or loss		(3,846)		330		(3,516)
Currency translation effects		(118)		(23)		(141)
Balance at September 30, 2018	$	—	$	1,942	$	1,942

Schedule of changes in assumptions for fair value of warrants

		Total warrants
	in thousands
Base case	$	1,085
Increase volatility by 10% to 82.5%		291
Extend exercise dates by one year		36