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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 |  |

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