Annual increase of shares reserved for issuance end date.

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Share based compensation arrangement by share based payment award offerings of purchase periods.

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Share based compensation arrangement by share based payment award purchase price of common stock percent in voting power criteria.

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- Definition

Share based compensation arrangement by share based payment award rights to purchase stock that remains outstanding.

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- Definition

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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- Definition

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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- Definition

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

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- Definition

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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No definition available.

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- Definition

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

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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No definition available.

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- Definition

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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The excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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- Definition

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

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No definition available.

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Stock Based Awards - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	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		$ 600,000	$ 400,000
Number of shares reserved	3,774,712	3,253,969
Common stock, voting rights	One
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				2,500
End date of automatic annual increase of shares reserved for issuance	Jan. 01, 2024
Additional shares issued	50,000
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%	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%	85.00%
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vesting period	4 years	4 years
Stock options, weighted-average grant date fair value	$ 7.69	$ 4.69
Tax benefits realized from options and other share-based payment arrangements	$ 0	$ 0
Weighted-average remaining vesting period	2 years 8 months 12 days
Unrecognized employee stock-based compensation	$ 2,900,000
Incremental compensation costs	$ 400,000
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	1,600,703
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 Aravive Biologics 2017 Equity Incentive Plan and the 2010 Equity Incentive Plan, as amended (Prior Plans).