Financial Instruments - Fair Values and Risk Management - Summary of Carrying Amount and Fair Value of Financial Assets and Financial Liabilities (Detail) - EUR (€) € in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of detailed information about financial instruments [line items]
Total financial assets	€ 117,356	€ 107,235	€ 125,716
Total financial liabilities	161,226	155,573	143,545
Gross carrying amount [member] \| Forward exchange contract [member]
Disclosure of detailed information about financial instruments [line items]
Total financial assets	218	339	223
Total financial liabilities	320	267	1,293
Gross carrying amount [member] \| Long-term borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	20,943	25,717	17,961
Gross carrying amount [member] \| Long-term borrowings [member] \| Floating-rate borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	13,943	18,197	16,926
Gross carrying amount [member] \| Long-term borrowings [member] \| Fixed rate borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	7,000	7,520	1,035
At fair value [member] \| Forward exchange contract [member]
Disclosure of detailed information about financial instruments [line items]
Total financial assets	218	339	223
Total financial liabilities	320	267	1,293
At fair value [member] \| Long-term borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	20,943	25,717	17,961
At fair value [member] \| Long-term borrowings [member] \| Floating-rate borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	13,943	18,197	16,926
At fair value [member] \| Long-term borrowings [member] \| Fixed rate borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Total financial liabilities	€ 7,000	€ 7,520	€ 1,035

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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