v3.20.1
Consolidated Statements of Operations and Comprehensive Loss - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]    
License revenue, and other   $ 20,157,430
Type of Revenue [Extensible List]   arpo:LicenseRevenueAndOtherMember
Operating expenses    
Research and development $ 12,824,402 $ 17,852,756
General and administrative 9,756,185 13,485,918
Restructuring expense 1,863,495  
Total operating expenses 24,444,082 31,338,674
Loss from operations (24,444,082) (11,181,244)
Grant income 142,729 6,394
Interest income 1,030,839 778,215
Total other income 1,173,568 784,609
Net and comprehensive loss $ (23,270,514) $ (10,396,635)
Net and comprehensive loss per share    
Basic and diluted $ (0.57) $ (0.31)
Weighted average number of common shares used in computing net loss per share attributable to common stockholders, basic and diluted 40,588,004 33,930,846