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Summary of significant accounting policies - Fair value of common stock (Details) - $ / shares | Jul. 15, 2019 | Dec. 31, 2018 | Oct. 02, 2017 | May 31, 2016
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Summary of significant accounting policies |  |  |  |
Fair value of unlisted common stock | $ 10.95 | $ 3.18 | $ 1.01 | $ 0.92

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- Definition Third party valuation of unlisted common stock using probability weighed expected return method where the equity value in one or more scenarios is calculated using an option pricing method. + References No definition available. + Details
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Namespace Prefix: | apre_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration