| Component: (Network and Table) | |
|---|---|
| Network | 
 1003 - Statement - Consolidated statement of Financial Position 
(http://www.ablynx.com/taxonomy/role/StatementOfFinancialPositionCurrentNonCurrent-210000)  | 
| Table | (Implied) | 
| Reporting Entity [Axis] | 0001617582 (http://www.sec.gov/CIK) | 
| Statement of financial position [abstract] | Period [Axis] | ||
|---|---|---|---|
| 
 2017-12-31  | 
 2016-12-31  | 
 2015-12-31  | |
| 
 Statement of financial position [abstract]  | 
 | 
 | 
 | 
| 
 ASSETS  | 
 | 
 | 
 | 
| 
 Intangible assets  | 
 | 
 | 
 | 
| 
 Property, plant & equipment  | 
 | 
 | 
 | 
| 
 Restricted cash  | 
 | 
 | 
 | 
| 
 Non-current other financial assets  | 
 | 
||
| 
 Non-current research and development incentives receivable  | 
 | 
 | 
 | 
| 
 Non-currentassets  | 
 | 
 | 
 | 
| 
 Trade and other receivables  | 
 | 
 | 
 | 
| 
 Current research and development incentives receivable  | 
 | 
 | 
 | 
| 
 Other current assets  | 
 | 
 | 
 | 
| 
 Other financial assets  | 
 | 
 | 
 | 
| 
 Cash and cash equivalents  | 
 | 
 | 
 | 
| 
 Current assets  | 
 | 
 | 
 | 
| 
 Total assets  | 
 | 
 | 
 | 
| 
 EQUITY AND LIABILITIES  | 
 | 
 | 
 | 
| 
 Share capital  | 
 | 
 | 
 | 
| 
 Share premium account  | 
 | 
 | 
 | 
| 
 Reserves  | 
 | 
 | 
 | 
| 
 Accumulated losses  | 
 (  | 
 (  | 
 (  | 
| 
 Equity attributable to the equity holders  | 
 | 
 | 
 | 
| 
 Financial liabilities  | 
 | 
 | 
 | 
| 
 Non-current deferred income  | 
 | 
 | 
 | 
| 
 Non-current liabilities  | 
 | 
 | 
 | 
| 
 Trade and other payables  | 
 | 
 | 
 | 
| 
 Current deferred income  | 
 | 
 | 
 | 
| 
 Current liabilities  | 
 | 
 | 
 | 
| 
 Total equity and liabilities  | 
 | 
 | 
 |