Stockholder's Equity - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 08, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 376,000	$ 800,000	$ 1,581,000	$ 2,789,000
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, weighted-average grant date fair value				$ 7.82	$ 4.69
Options vesting period				4 years
Tax benefits realized from options and other share-based payment arrangements				$ 0
Weighted-average remaining vesting period				2 years 10 months 24 days
Unrecognized employee stock-based compensation		$ 3,400,000		$ 3,400,000
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			$ 400,000	$ 300,000	$ 1,200,000
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance		1,573,254		1,573,254
Percentage of common stock issued and outstanding increase annually				4.50%
Equity awards, expiration date				Jan. 01, 2029
Equity incentive plan modification, description				The 2019 Plan is a successor to and continuation of all prior plans including the Company’s 2014 Equity Incentive Plan and Private Aravive’s 2017 Equity Incentive Plan and the 2010 Equity Incentive Plan, as amended (the “Prior Plans”).
Investment Agreement [Member] | Unregistered Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock purchased, shares	931,098
Shares of common stock purchased, value	$ 5,000,000
Stock issuance costs	$ 78,000