Common stock capital amount reserved for future issuance.

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- Definition

Common stock weighted average price.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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No definition available.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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No definition available.

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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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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No definition available.

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- Definition

Number of new stock issued during the period.

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Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020	May 03, 2021	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from sale of common stock, net of commission		$ 51,049,000	$ 761,000
Net proceeds from issuances of common stock		51,049,000	$ 761,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities offered					$ 175,000,000.0
Cantor Fitzgerald Co [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from sale of common stock, net of commission	$ 45,600
Sale of stock number of shares issued in transaction	20,364,582
Sale of stock price per share	$ 2.2386
Net proceeds from issuances of common stock	$ 45,600
Common stock issuance costs	195,000,000,000
Gross proceeds from sale of common stock	$ 45,400,000
2015 Sales Agreement [Member] \| IPO [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for sale				$ 56,200,000
2015 Sales Agreement [Member] \| Cantor Fitzgerald Co [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from sale of common stock, net of commission		$ 2,400,000
Sale of common stock during period		950,009,000	0
Common stock weighted average price		$ 2.60
Net proceeds from issuances of common stock		$ 2,400,000
2015 Sales Agreement [Member] \| Cantor Fitzgerald Co [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Securities offered					$ 75,000,000.0
2018 Registration Statement [Member] \| Maximum [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for sale				$ 95,600,000