Stockholder's Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of stock option exercised	$ 38,000,000
Stock-based compensation expense	$ 717,000	$ 1,048,000
Restricted stock unit remaining weighted average period	5 years 4 months 24 days
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, weighted-average grant date fair value	$ 9.77	$ 5.52
Options vesting period	4 years
Tax benefits realized from options and other share-based payment arrangements	$ 0
Weighted-average remaining vesting period	3 years 2 months 12 days
Unrecognized employee stock-based compensation	$ 4,800,000
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	200,000	$ 400,000
Approximate compensation expenses	$ 1,200,000
Restricted stock unit remaining weighted average period	3 years
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	1,650,133
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”).