Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Total revenue	$ 256,000
Revenue, Product and Service [Extensible List]	arav:CollaborationRevenueMember	arav:CollaborationRevenueMember
Operating expenses
Research and development	$ 5,884,000	$ 3,491,000
General and administrative	2,380,000	3,951,000
Loss on impairment of long-lived assets	0	2,870,000
Total operating expenses	8,264,000	10,312,000
Loss from operations	(8,008,000)	(10,312,000)
Interest income	9,000	217,000
Other income (expense), net	(5,000)	(701,000)
Net loss	$ (8,004,000)	$ (10,796,000)
Net loss per share - basic and diluted	$ (0.44)	$ (0.72)
Weighted-average common shares used to compute basic and diluted net loss per share	18,067	15,013