Consolidated and combined balance sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents (Note 4)	$ 14,906,087	$ 11,006,392
Short-term investments (Note 14)	24,191,219	2,820,600
Accounts and other amounts receivable (Note 5)	65,447	27,946
Prepayments and deposits	139,006aqxp_PrepaymentsAndDepositsCurrent	63,975aqxp_PrepaymentsAndDepositsCurrent
Deferred offering costs		1,377,438us-gaap_DeferredOfferingCosts
Total current assets	39,301,759us-gaap_AssetsCurrent	15,296,351us-gaap_AssetsCurrent
Property and equipment, net (Note 6)	104,694us-gaap_PropertyPlantAndEquipmentNet	75,465us-gaap_PropertyPlantAndEquipmentNet
Long-term investments (Note 14)	2,003,099
Other	13,395us-gaap_OtherAssetsNoncurrent	277,290us-gaap_OtherAssetsNoncurrent
Total assets	41,422,947us-gaap_Assets	15,649,106us-gaap_Assets
Current liabilities
Accounts payable and accrued liabilities (Note 7)	5,203,308	2,350,660
Current portion of bank loan (Note 8)		250,000us-gaap_LoansPayableToBankCurrent
Other		19,445us-gaap_OtherLiabilitiesCurrent
Total current liabilities	5,203,308us-gaap_LiabilitiesCurrent	2,620,105us-gaap_LiabilitiesCurrent
Warrant liabilities (Note 10)	72,341us-gaap_DerivativeLiabilitiesNoncurrent	221,320us-gaap_DerivativeLiabilitiesNoncurrent
Redemption option on preferred stock (Note 14)		800,206
Accrued tax payable on preferred stock (Note 13)	0	1,797,412
Bank loan (Note 8)		2,036,489us-gaap_LongTermLoansFromBank
Other		8,560us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	5,275,649us-gaap_Liabilities	7,484,092us-gaap_Liabilities
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		73,858,722
Commitments and contingencies (Note 16)
Common stock (Note 11)
Common stock	11us-gaap_CommonStockValue
Preferred stock (Note 9)
Preferred stock
Additional paid-in capital	125,566,705us-gaap_AdditionalPaidInCapital
Accumulated deficit	(89,415,563)	(65,693,708)
Accumulated other comprehensive income	(3,855)
Total stockholders' equity (deficit)	36,147,298us-gaap_StockholdersEquity	(65,693,708)us-gaap_StockholdersEquity
Total liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit)	41,422,947	15,649,106
Series A Preferred Stock [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock	0	11,157,138
Series B Preferred Stock [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		21,091,150
Series C Preferred Stock [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		13,765,741
Aquinox Pharmaceuticals (Canada) Inc. [Member] \| Series A Exchangeable Preferred Shares [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		13,329,639
Aquinox Pharmaceuticals (Canada) Inc. [Member] \| Series B Exchangeable Preferred Shares [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		10,684,093
Aquinox Pharmaceuticals (Canada) Inc. [Member] \| Series C Exchangeable Preferred Shares [Member]
Redeemable convertible preferred stock (Note 9)
Redeemable convertible preferred stock		$ 3,830,961

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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