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Loan facility - Schedule of Loan Facility (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Beginning balance $ 2,286,489us-gaap_LineOfCredit  
Accrued interest 9,844us-gaap_LineOfCreditFacilityIncreaseAccruedInterest  
Term loan, amount borrowed   2,500,000us-gaap_ProceedsFromLinesOfCredit
Accretion of warrant discount 213,511aqxp_AccretionOfWarrantDiscount  
Warrant discount   (226,255)aqxp_DiscountOnIssuanceOfWarrants
Repayment fee and penalty 100,000aqxp_FeeAndPenaltyOnBankLoanRepayment  
Financing costs   12,744aqxp_AccretionOfWarrantDiscount1
Repayment of bank loan and interest (2,609,844)us-gaap_RepaymentsOfLinesOfCredit  
Ending balance   $ 2,286,489us-gaap_LineOfCredit