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Income taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income taxes

Schedule of loss before income taxes

		Years ended December 31,
		2016			2015			2014
		in thousands
Dutch operations		$	(51,107	)	$	(63,304	)	$	(41,063	)
U.S. operations			(21,221	)		(20,406	)		(8,937	)
Foreign operations			99			448			(312	)
​	​	​	​	​	​	​	​	​	​	​
Total		$	(72,229	)	$	(83,262	)	$	(50,312	)
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

Schedule of income tax benefit / (expense)

		Years ended December 31,
		2016			2015			2014
		in thousands
Current benefit / (expense)
Dutch operations		$	—		$	—		$	—
U.S. operations			—			—			—
Foreign operations			(51	)		(51	)		—
Deferred benefit / (expense)
Dutch operations			(1,094	)		714			535
U.S. operations			—			—			—
Foreign operations			—			516			—
​	​	​	​	​	​	​	​	​	​	​
Total income tax benefit / (expense)		$	(1,145	)	$	1,179		$	535
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

Schedule of reconciliation of statutory income tax rate to effective tax rate

		December 31, 2016			December 31, 2015			December 31, 2014
		in thousands
Net loss before tax for the period		$	(72,229	)	$	(83,262	)	$	(50,312	)
Expected tax benefit / (expense) at the tax rate enacted in the Netherlands (25%)			18,057			20,816			12,578
Difference in tax rates between the Netherlands and foreign countries			1,905			1,816			819
Net change in valuation allowance			(20,054	)		(16,301	)		(10,843	)
Non deductible expenses			(1,323	)		(4,984	)		(2,111	)
Deductible expenses directly recognized in equity			—			168			139
Change in fair value of contingent consideration			270			(336	)		(47	)
​	​	​	​	​	​	​	​	​	​	​
Income tax benefit / (expense)		$	(1,145	)	$	1,179		$	535
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

Schedule of significant portions of deferred tax assets and deferred tax liabilities

		December 31, 2016			December 31, 2015
					in thousands
Deferred tax assets:
Net operating loss carryforwards		$	59,468		$	40,236
Intangible assets			1,621			1,986
Property, plant and equipment			1,412			1,202
Deferred revenue			19,997			21,410
Accrued revenue			—			962
Accrued expenses and other current liabilities			144			935
​	​	​	​	​	​	​	​
Gross deferred tax asset		$	82,642		$	66,731
Less valuation allowance			(82,642	)		(65,593	)
​	​	​	​	​	​	​	​
Net deferred tax asset			—			1,138
Deferred tax liabilities:
Intangible assets			—			—
Long-term loan to foreign operation			—			(1,138	)
​	​	​	​	​	​	​	​
Net deferred tax liability		$	—		$	(1,138	)
​	​	​	​	​	​	​	​
Net deferred tax asset/(liability)		$	—		$	—
​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​

Summary of expiration dates for losses

		2017			2018			2019			2020			2021
		in thousands
Loss expiring		$	21,523			17,579			19,070			17,333			13,043

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
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