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Stock Warrants - Stock Warrants (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2020 $ / shares shares | Oct. 15, 2018 USD ($) $ / shares shares | Oct. 15, 2018 USD ($) $ / shares shares | Oct. 10, 2018 shares | Nov. 18, 2016 USD ($) item $ / shares shares | Oct. 31, 2018 $ / shares | Sep. 30, 2021 $ / shares shares | Sep. 30, 2020 shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($) $ / shares | Nov. 18, 2020 USD ($) | Nov. 15, 2020 $ / shares | Nov. 06, 2020 $ / shares | Nov. 05, 2020 $ / shares
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from "at the market" stock issuance | $ |  | $ 18,600,000 | $ 18,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  | 78,700,000 |  |  |  |  |  |
Exercise price per warrant | $ / shares | $ 0.69 | $ 0.69 | $ 0.69 |  |  | $ 0.69 |  |  |  |  |  |  | $ 1.38 | $ 0.69 | $ 1.38
Preferred Stock, Par or Stated Value Per Share | $ / shares | $ 0.001 |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  | $ 1,000 |  |  |  |
Effect of Warrant exercise price adjustment | $ |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |
Percentage of issue of the public offering |  |  |  |  |  | 120.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from exercise of warrants | $ |  |  |  |  |  |  |  |  | $ 8,042,000 | $ 0 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  |  |  |  |  |  |  | $ 65,960,000 | $ 0 |  |  |  |  |
Warrants Exercised |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Conversion Price Per Share | $ / shares |  | $ 1.15 | $ 1.15 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 13,672,173 | 13,672,173 |  |  |  |  | 1,379 | 3,973 | 3,492 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 13,672,173 | 13,672,173 |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Share sold | item |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares purchase | item |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 714,286 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  |  |  | $ 35.00 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 1,428,571 |  |  |  |  |  |  |  |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure | $ |  |  |  |  | $ 15,700,000 |  |  |  |  |  |  | $ 100,000,000 |  |  |
IPO [Member] | Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per warrant | $ / shares |  |  |  |  | $ 60.20 |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,428,825 |  |  | 2,428,825 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 2,428,825 |  |  | 2,428,825 |  |  |  |  |  |  |  |  |  |  |
Issue of warrants to purchase common stock | 1,807,826 |  |  | 1,807,826 |  |  |  |  |  |  |  |  |  |  |
Underwritten Public Offering [Member] | October 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Warrants [Member] | IPO [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per warrant | $ / shares |  |  |  |  | $ 50.05 |  |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  | 11,655,747 |  | 11,655,747 |  |  |  |  |  |
Warrant [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 13,672,173 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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