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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
License revenue, and other   $ 1,333,333   $ 1,333,333
Type of Revenue [Extensible List]   arpo:LicenseRevenueAndOtherMember   arpo:LicenseRevenueAndOtherMember
Operating expenses        
Research and development $ 2,264,255 $ 4,228,934 $ 7,850,506 $ 8,257,746
General and administrative 2,799,570 3,140,854 6,054,612 6,588,690
Restructuring expense 915,094   915,094  
Total operating expenses 5,978,919 7,369,788 14,820,212 14,846,436
Loss from operations (5,978,919) (6,036,455) (14,820,212) (13,513,103)
Grant income 4,924   20,272  
Interest income 290,379 46,464 623,499 97,580
Total other income 295,303 46,464 643,771 97,580
Net and comprehensive loss $ (5,683,616) $ (5,989,991) $ (14,176,441) $ (13,415,523)
Net and comprehensive loss per share        
Basic and diluted $ (0.14) $ (0.22) $ (0.35) $ (0.49)
Weighted average number of common shares used in computing net and comprehensive loss per share, basic and diluted 40,588,004 27,340,914 40,588,004 27,194,028