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Stock-Based Compensation - Schedule of Employee Awards and Non-employee Director Award Plan Activity (Parenthetical) (Detail) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020
Exercise of Common Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years	4 years
Weighted average exercise price of the stock options granted	$ 1.34	$ 1.25
Weighted average grant date fair value of the stock options granted	$ 0.99	$ 0.93
Risk-free interest rate	0.39%	0.79%
Expected life	5 years 8 months 1 day	5 years 8 months 1 day
Volatility rate	93.83%	93.83%
Dividend yield	0.00%	0.00%
Employees Awards | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units weighted average grant date fair value	$ 1.34	$ 1.25
Vesting period	4 years	4 years
Non-employee Directors Awards | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units weighted average grant date fair value	$ 1.34	$ 1.17

X

- Definition

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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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Expected term of 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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