Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (unaudited) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
License revenue, and other		$ 18,821,953		$ 20,155,286
Type of Revenue [Extensible List]		arpo:LicenseRevenueAndOtherMember		arpo:LicenseRevenueAndOtherMember
Operating expenses
Research and development	$ 2,844,603	$ 4,346,381	$ 10,695,109	$ 12,604,125
General and administrative	2,160,845	3,277,535	8,215,456	9,866,227
Restructuring (benefit) expense	(38,810)		876,284
Total operating expenses	4,966,638	7,623,916	19,786,849	22,470,352
(Loss) income from operations	(4,966,638)	11,198,037	(19,786,849)	(2,315,066)
Grant income	79,303	6,394	99,574	6,394
Interest income	239,405	333,047	862,904	430,626
Total other income	318,708	339,441	962,478	437,020
Net and comprehensive (loss) income	$ (4,647,930)	$ 11,537,478	$ (18,824,371)	$ (1,878,046)
Net and comprehensive (loss) income per share
Basic and diluted	$ (0.11)	$ 0.28	$ (0.46)	$ (0.06)
Weighted average number of common shares used in computing net and comprehensive (loss) income per share
Basic	40,588,004	40,527,722	40,588,004	31,687,434
Diluted	40,588,004	40,961,620	40,588,004	31,687,434

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