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Stockholders' equity - Reduction of Authorized Shares (Details) - shares	Jun. 30, 2018	Dec. 31, 2017
Conversion of Stock [Line Items]
Authorized Shares of Common Stock	50,000,000	200,000,000
Original Number of Shares Authorized [Member]
Conversion of Stock [Line Items]
Authorized Shares of Common and Preferred Stock	240,000,000
Current Number of Shares Authorized [Member]
Conversion of Stock [Line Items]
Authorized Shares of Common and Preferred Stock	55,000,000
Authorized Shares of Preferred Stock	5,000,000
Authorized Shares of Common Stock	50,000,000

X

- Definition

The number of common and preferred shares authorized by the Company.

+ References

No definition available.

+ Details

Name:	aqb_AuthorizedShares
Namespace Prefix:	aqb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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