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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2019
Text block [abstract] |
Summary of Revenue | The Company’s revenues are generated entirely in the Netherlands. In the following table, revenue is disaggregated by primary source of revenue as follows:
|  | Three months ended |  |  | Six months ended |
|  | June 30, 2019 |  |  | June 30, 2018 |  |  | June 30, 2019 |  |  | June 30 2018 |
|  | (euros in thousands) |  |  | (euros in thousands) |
Upfront payment amortization |  |  | 4,231 |  |  |  | 4,250 |  |  |  | 8,436 |  |  |  | 9,087 |
R&D cost reimbursement |  |  | 1,383 |  |  |  | 2,040 |  |  |  | 3,806 |  |  |  | 4,556 |
Milestone revenue |  |  | 74 |  |  |  | 139 |  |  |  | 1,148 |  |  |  | 2,639 |
Revenue from contracts with customers |  |  | 5,688 |  |  |  | 6,429 |  |  |  | 13,390 |  |  |  | 16,282 |
Income (expense) from grants on research projects |  |  | (109 | ) |  |  | 114 |  |  |  | (109 | ) |  |  | 182 |
|  | 5,579 |  |  | 6,543 |  |  | 13,281 |  |  | 16,464 |
Summary of Changes in Tarde Receivables, Contract Assets and Contract Liabilities | The following table presents changes in the Company’s trade receivables, contract assets and contract liabilities during the six months ended June 30, 2019:
|  | Balance at December 31, 2018 |  |  | Additions |  |  | Deductions |  |  | Balance at June 30, 2019 |
|  | (euros in thousands) |
Trade receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  | 2,690 |  |  |  | 5,819 |  |  |  | (7,116 | ) |  |  | 1,393 |
Total trade receivables |  |  | 2,690 |  |  |  | 5,819 |  |  |  | (7,116 | ) |  |  | 1,393 |
Contract assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unbilled receivables |  |  | 236 |  |  |  | 114 |  |  |  | (278 | ) |  |  | 72 |
Total contract assets |  |  | 236 |  |  |  | 114 |  |  |  | (278 | ) |  |  | 72 |
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue |  |  | 114,609 |  |  |  | 848 |  |  |  | (8,583 | ) |  |  | 106,874 |
Total contract liabilities |  |  | 114,609 |  |  |  | 848 |  |  |  | (8,583 | ) |  |  | 106,874 |

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- Definition The entire disclosure for revenue from contracts with customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Section Presentation -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=sect_Presentation&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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