Common stock increase in capital shares reserved for future issuance in period shares.

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Exercise price as percentage of fair value of common stock.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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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 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

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

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No definition available.

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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

Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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Stock-Based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 29, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance		12,000,000
Shares of common stock available for future issuance		499,196
Stock options issued to purchase common stock		10,189,819			9,583,349
Stock price				$ 0.82
Options granted to purchase common stock		712,500
Contractual term granted		7 years 4 months 13 days
Exercise price per share on date of grant		$ 0.60
Compensation expense recognized		$ 584,000	$ 583,000
Total unrecognized stock-based compensation expense related to stock options granted		$ 5,400,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards, vesting period		4 years
Awards, Expiration period		10 years
Weighted-average grant date fair value of stock options granted		$ 0.46	$ 2.18
Total unrecognized stock-based compensation expense, weighted-average period Recognition		2 years 7 months 6 days
Awards With Performance-Based Vesting Conditions
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options issued to purchase common stock		487,759
Contingent Option Awards \| 2019 Equity Incentive Plan \| Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards, vesting period	4 years
Options granted to purchase common stock	3,303,600
Contractual term granted	10 years
Exercise price per share on date of grant	$ 0.62
Description of share based payment award		The Contingent Option Awards vest in equal monthly installments over four years, subject to the officer’s continued employment with the Company; provided, that the Contingent Option Awards will automatically terminate and be forfeited if the Company’s stockholders do not approve the 2019 Equity Incentive Plan within 12 months of the grant date of the options, and further provided that the options will not be exercisable, and no common stock will be issuable thereunder, before the approval of the 2019 Equity Incentive Plan by the Company’s stockholders.
Compensation expense recognized		$ 0
Minimum \| Stock Options \| Participants Who Own Less than 10% of Total Combined Voting Power
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of incentive stock options as percentage of fair market value of common stock on the date of the award		100.00%
Maximum \| Stock Options \| Participants Who Own More than 10% of Total Combined Voting Power
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of incentive stock options as percentage of fair market value of common stock on the date of the award		110.00%