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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, 2021 | Dec. 31, 2020
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Disclosure of credit risk exposure [line items] |  |
Total gross carrying amount | € 41,259 | € 33,934
Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Total gross carrying amount | 46,584 | 41,815
Credit risk [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Trade receivables subject to collective valuation | 16,055 | 10,007
Trade receivables subject to specific valuation | 30,529 | 31,808
Total gross carrying amount | 46,584 | 41,815
Expected credit loss | 101 | 310
Less than Thirty days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Total gross carrying amount | 7,854 | 3,877
Less than Thirty days [member] | Credit risk [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Trade receivables subject to collective valuation | € 15,783 | € 9,480
Default rate | 0.54% | 0.56%
Expected credit loss | € 85 | € 53
Thirty to sixty days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Total gross carrying amount | 1,030 | 1,105
Thirty to sixty days [member] | Credit risk [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Trade receivables subject to collective valuation | € 266 | € 264
Default rate | 5.55% | 5.79%
Expected credit loss | € 15 | € 15
Sixty One Days To Ninety Days [member] |  |
Disclosure of credit risk exposure [line items] |  |
Total gross carrying amount | 355 | 347
Sixty One Days To Ninety Days [member] | Credit risk [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Trade receivables subject to collective valuation | € 6 | € 24
Default rate | 12.71% | 13.08%
Expected credit loss | € 1 | € 3
Past Due Greater Than Ninety Days [member] | Credit risk [member] | Gross carrying amount [member] |  |
Disclosure of credit risk exposure [line items] |  |
Trade receivables subject to collective valuation |  | € 239
Default rate | 28.86% | 100.00%
Expected credit loss |  | € 239

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