Percentage of commission rate gross sales price.

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- Definition

Public offering of common stock authorized for sale.

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No definition available.

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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.

+ References

No definition available.

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- Definition

The cash inflow associated with the amount received from the stock plan during the period.

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-Publisher FASB
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- Definition

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

+ References

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.

+ References

No definition available.

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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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-Topic 718
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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Definition

Number of new stock issued during the period.

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Stockholders' Equity (Deficit) - Common Stock and Warrants - Additional Information (Details) - USD ($)			1 Months Ended			3 Months Ended		6 Months Ended
	Aug. 04, 2021	Feb. 08, 2021	Mar. 31, 2021	Feb. 28, 2021	Nov. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Common Stock [Member]
Class Of Stock [Line Items]
Proceeds from stock plans		$ 47,300,000		$ 96,600,000
Shares issued for sale of common stock, net of cost, shares				59,459,460		125,000	92,870,000
Shares issued, price per share				$ 1.85
Warrant [Member]
Class Of Stock [Line Items]
Aggregate intrinsic value of options exercised								$ 1,100
2020 ATM Program [Member] \| Common Stock [Member]
Class Of Stock [Line Items]
Public offering of common stock authorized for sale					$ 50,000,000.0
Sale of stock, number of shares issued in transaction		28,600,689
2021 ATM Program [Member] \| Common Stock [Member]
Class Of Stock [Line Items]
Public offering of common stock authorized for sale			$ 100,000,000.0
Percentage of commission rate gross sales price			3.00%		3.00%		3.00%
Sale of stock, number of shares issued in transaction								4,935,500
Sale of stock, price Per share		$ 1.75				$ 1.58		$ 1.58
Proceeds from stock plans								$ 7,200,000
2021 ATM Program [Member] \| Common Stock [Member] \| Subsequent Event [Member]
Class Of Stock [Line Items]
Sale of stock, number of shares issued in transaction	28,769,815
Sale of stock, price Per share	$ 1.14
Proceeds from stock plans	$ 31,800,000