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Equity Capital Structure, 2020 June Equity Offering (Details) |  |  |  | 2 Months Ended | 12 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2020 USD ($) shares | Oct. 17, 2019 shares | Sep. 22, 2017 shares | Sep. 09, 2019 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Jun. 21, 2021 shares | Jun. 23, 2020 $ / shares shares
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Number of units included in June Equity Offering (in shares) |  |  |  |  |  |  |  |  | 5,911,000
Gross proceeds from issuance of common stock and warrants | $ |  |  |  | $ 2,600,000 | $ 265,307,807 | $ 39,053,325 | $ 2,625,590 |  |
Net proceeds from issuance of common stock and warrants | $ |  |  |  | $ 2,300,000 |  |  |  |  |
Prefunded Warrant [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Number of securities included in each unit offered (in shares) |  |  |  |  |  |  |  |  | 1
Number of securities called by each warrant (in shares) |  |  |  |  |  |  |  |  | 1
Warrant exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.10
Class A Warrant [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Number of securities included in each unit offered (in shares) |  |  |  |  |  |  |  |  | 1
Number of securities called by each warrant (in shares) |  |  |  |  |  |  |  |  | 1
Warrant exercise price per share (in dollars per share) | $ / shares |  |  |  |  | $ 3.50 |  |  |  | $ 3.50
Issuance of warrants (in shares) | 5,911,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock and warrants | $ |  |  |  |  | $ 19,400,000 | $ 1,100,000 |  |  |
Term of warrant |  |  |  |  | 5 years |  |  |  |
Warrants exercised (in shares) |  |  |  |  | 5,546,706 | 301,950 |  |  |
Warrants outstanding (in shares) |  |  |  |  | 62,344 |  |  |  |
Fair value of warrants | $ |  |  |  |  | $ 22,400,000 |  |  |  |
Percentage increase in volatility causing increase in fair value of warrants |  |  |  |  | 5.00% |  |  |  |
Percentage increase in fair value of warrants due to increase in volatility |  |  |  |  | 1.40% |  |  |  |
Class A Warrant [Member] | Historical Volatility Measurement Input [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Measurement input |  |  |  |  | 1.535 |  |  |  |
Class A and Prefunded Warrant [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Warrant exercise price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 3.40
Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Number of securities included in each unit offered (in shares) |  |  |  |  |  |  |  |  | 1
Issuance of common stock (in shares) |  | 30,000 | 240,000 | 61,811 | 4,654,240 |  | 61,811 | 0 |
Gross proceeds from issuance of common stock and warrants | $ |  |  |  |  | $ 12,900,000 |  |  |  |
Net proceeds from issuance of common stock and warrants | $ |  |  |  |  | $ 12,400,000 |  |  |  |
2020 June Equity Offering [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | 5,908,269 |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock and warrants | $ | $ 20,700,000 |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock and warrants | $ | $ 18,600,000 |  |  |  |  |  |  |  |
2020 June Equity Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  | 5,908,269 |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |
Equity Capital Structure [Abstract] |  |  |  |  |  |  |  |  |
Issuance of units (in shares) | 771,000 |  |  |  |  |  |  |  |

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