Equity Capital Structure, 2021 Second Registered Direct Equity Offering (Details)
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2 Months Ended |
12 Months Ended |
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Feb. 10, 2021
USD ($)
shares
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Jan. 12, 2021
USD ($)
$ / shares
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Jan. 08, 2021
shares
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Sep. 09, 2019
USD ($)
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Dec. 31, 2021
USD ($)
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Dec. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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| Equity Capital Structure [Abstract] |
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| Gross proceeds from issuance of common stock and warrants |
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$ 2,600,000
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$ 265,307,807
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$ 39,053,325
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$ 2,625,590
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| Net proceeds from issuance of common stock and warrants |
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$ 2,300,000
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| January 12 Warrants [Member] |
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| Equity Capital Structure [Abstract] |
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| Issuance of common stock (in shares) | shares |
13,700,000
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| Number of securities called by warrants (in shares) | shares |
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13,700,000
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| Gross proceeds from issuance of common stock and warrants |
$ 26,000,000.0
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| Net proceeds from issuance of common stock and warrants |
$ 26,000,000.0
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| Term of warrant |
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5 years
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| Warrant exercise price (in dollars per share) | $ / shares |
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$ 1.90
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| Fair value of warrants |
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$ 37,300,000
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| Percentage increase in volatility causing increase in fair value of warrants |
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5.00%
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| Percentage increase in fair value of warrants due to increase in volatility |
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1.30%
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| January 12 Warrants [Member] | Historical Volatility Measurement Input [Member] |
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| Equity Capital Structure [Abstract] |
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| Measurement input - Volatility |
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1.521
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| 2021 Second Registered Direct Equity Offering [Member] |
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| Equity Capital Structure [Abstract] |
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| Issuance of common stock (in shares) | shares |
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13,700,000
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| Gross proceeds from issuance of common stock and warrants |
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$ 26,000,000.0
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| Net proceeds from issuance of common stock and warrants |
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$ 24,100,000
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