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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Description of modification of award under share-based payment arrangement. Includes, but is not limited to, terms for expiration date, vesting rights and exercise price.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stock Based Awards - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Mar. 20, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of stock option exercised		$ 400,000	$ 0
Stock options granted		483,328
Number of shares reserved		3,253,969	2,835,101
Common stock, voting rights		One
Stock-based compensation expense		$ 3,399,000	$ 16,139,000
Restricted stock unit remaining weighted average period		6 years 7 months 6 days
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of common stock issued and outstanding increase annually		1.00%
Number of shares reserved				416
Additional shares issued	2,500	50,000
End date of automatic annual increase of shares reserved for issuance		Jan. 01, 2024
Common stock, voting rights		Immediately after the grant would own stock possessing 5% or more of the total combined voting power or value of our common stock.
Percentage of stock possessing		5.00%
Rights to purchase stock that remains outstanding		$ 25,000
Offerings of purchase periods		27 months
Maximum employee subscription rate		15.00%
Employee Stock Purchase Plan [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of purchase price common stock		85.00%
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vesting period		4 years
Stock options, weighted-average grant date fair value		$ 4.69
Tax benefits realized from options and other share-based payment arrangements		$ 0
Weighted-average remaining vesting period		2 years 9 months 18 days
Unrecognized employee stock-based compensation		$ 2,000,000
Employee Stock Option [Member] \| Employee [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		0
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 1,400,000	$ 3,200,000
Approximate compensation expenses		$ 700,000
Restricted stock unit remaining weighted average period		2 years
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance		1,391,697
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).