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Trade and other payables (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Trade and other payables [Abstract]
Trade payables and other payables	$ 1,462,789	$ 881,394
Total	$ 1,462,789	$ 881,394

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- Definition

Amount of obligations incurred classified as trade payable and other payables within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	adn_TradePayablesAndOtherPayablesCurrent
Namespace Prefix:	adn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration