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Stockholder's Equity - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 800,000	$ 1,313,000	$ 2,789,000	$ 6,289,000
Restricted stock unit remaining weighted average period			7 years
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, weighted-average grant date fair value			$ 4.69
Options vesting period			4 years
Tax benefits realized from options and other share-based payment arrangements			$ 0
Weighted-average remaining vesting period			3 years
Unrecognized employee stock-based compensation	2,600,000		$ 2,600,000
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 400,000	$ 600,000	1,200,000	$ 2,500,000
Approximate compensation expenses			$ 1,100,000
Restricted stock unit remaining weighted average period			1 year 4 months 24 days
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	1,338,434		1,338,434
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 (Prior Plans).