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Financial Instruments - Fair Values and Risk Management - Summary of Information about Credit Risk Exposure on Trade Receivables Using a Provision Matrix (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | € 29,187 | € 40,967 |  | € 37,549
Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 37,886 | 50,594 |  |
Less than Thirty days [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 8,570 | 8,614 |  |
Thirty to sixty days [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 1,298 | 1,409 |  |
Sixty One Days To Ninety Days [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 2,531 | 1,274 |  |
Past Due Greater Than Ninety One Days [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 10,308 | 15,046 |  |
Credit risk [member] | Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Trade receivables subject to collective valuation | 5,632 | 11,368 | € 12,739 |
Trade receivables subject to specific valuation | 32,524 | 39,226 | 35,585 |
Total gross carrying amount | 37,886 | 50,594 | 48,324 |
Expected credit loss | 95 | 64 | 37 |
Credit risk [member] | Less than Thirty days [member] | Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Trade receivables subject to collective valuation | € 4,936 | € 9,288 | € 11,661 |
Default rate | 0.13% | 0.10% | 0.11% |
Expected credit loss | € 6 | € 9 | € 13 |
Credit risk [member] | Thirty to sixty days [member] | Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Trade receivables subject to collective valuation | € 387 | € 1,323 | € 651 |
Default rate | 1.42% | 0.99% | 1.04% |
Expected credit loss | € 5 | € 13 | € 7 |
Credit risk [member] | Sixty One Days To Ninety Days [member] | Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Trade receivables subject to collective valuation |  | € 88 | € 254 |
Default rate | 3.83% | 2.90% | 2.99% |
Expected credit loss |  | € 3 | € 8 |
Credit risk [member] | Past Due Greater Than Ninety One Days [member] | Gross trade receivables |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Trade receivables subject to collective valuation | € 309 | € 669 | € 173 |
Default rate | 27.07% | 5.80% | 5.33% |
Expected credit loss | € 84 | € 39 | € 9 |

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