Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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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

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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Stockholders' Equity - Sales of Securities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jan. 25, 2021	Jun. 12, 2020
At the Market (ATM) Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (per share)	$ 4.16
Common stock, capital shares reserved for future issuance (shares)			40,000,000
Sale of stock, number of shares issued in transaction	11,186,084
2020 and 2021 Sales Agreements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (per share)	$ 2.88
Proceeds from issuance or sale of equity	$ 74,999,785
Sale of stock, number of shares issued in transaction	26,005,824
2021 Sales Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (shares)		35,000,000
ATM Sales Agreement June 2021 Sales Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (shares)	100,000,000