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Income taxes (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + 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 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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