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Stock-Based Compensation and Warrants - Stock Warrants (Details) - USD ($) |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2018 | Oct. 10, 2018 | Oct. 10, 2014 | Nov. 18, 2016 | Mar. 03, 2021 | Feb. 28, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 16, 2020 | Nov. 15, 2020 | Oct. 31, 2018 | Dec. 26, 2017
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from "at-the-market" stock issuance | $ 18,600,000 |  |  |  |  |  | $ 3,359,000 | $ 0 |  |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  | $ 9,000
Effect of Warrant exercise price adjustment |  |  |  |  |  |  | $ 880,000 | $ 0 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 13,672,173 |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1.38 |  |  |  |  |  |  | $ 0.69 | $ 1.38 | $ 1.38 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 76,300,000 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 63,800,000 |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 11,655,747 |  |  |  |  |  |
Cash proceeds from exercise of warrants |  |  |  |  | $ 8,000,000 | $ 8,000,000 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Conversion Price Per Share | $ 1.15 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 1,000 |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted | 13,672,173 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  |  | $ 1.38 |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure |  |  |  | $ 15,700,000 |  |  |  | $ 100,000,000 |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 714,286 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 1,428,571 |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  | $ 35.00 |  |  |  |  |  |  |  |
IPO [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | 50.05 |  |  |  |  |  |  |  |
IPO [Member] | Series B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 60.20 |  |  |  |  |  |  |  |
IPO [Member] | Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 2,520,000 |  |  |  |  |  |  |  |  |  |
Share Price |  | $ 1.15 |  |  |  |  |  |  |  |  |  |
IPO [Member] | Series B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  | 15,723 |  |  |  |  |  |  |  |  |  |
Share Price |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,428,825 |  |  |  |  |  |  |  |  |  |
Issue of warrants to purchase common stock |  | 1,807,826 |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,428,825 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,428,825 |  |  |  |  |  |  |  |  |  |
Issue of warrants to purchase common stock |  | 1,807,826 |  |  |  |  |  |  |  |  |  |
Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 19,100,000 |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction |  |  | 14,059,616 |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Warrants Vested and Expected To Vest Outstanding Number |  |  | 61.25 |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  | $ 1.47 |  |  |  |  |  |  |  |  |
Issue of warrants to purchase common stock |  |  | 0.50 |  |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Warrants Exercisable Number |  |  |  |  |  |  |  |  |  |  |  | 714
Warrant [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 13,672,173 |  |  |  |  |  |  |  |  |  |  |

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