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Stock Warrants - Stock Warrants (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2020 | Oct. 15, 2018 | Oct. 15, 2018 | Oct. 10, 2018 | Nov. 18, 2016 | Jan. 31, 2021 | Oct. 31, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Nov. 15, 2020 | Nov. 06, 2020 | Nov. 05, 2020 | Dec. 31, 2019 | Dec. 26, 2017
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 | $ 0.69 | $ 1.38 | $ 1.38 |  |  |  | $ 1.38 |  |  |  | $ 1.38 | $ 0.69 | $ 1.38 |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.0010 |  |  |  |  |  |  | $ 1,000 |  | $ 1,000 |  |  |  |  |
Effect of Warrant exercise price adjustment |  |  |  |  |  |  |  |  |  | $ 880,000 |  |  |  |  |
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 |  |  |  |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 65,000,000 |  | $ 65,960,000 | $ 0 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  | $ 1,000 | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Conversion Price Per Share |  | $ 1.15 | $ 1.15 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 13,672,173 | 13,672,173 |  |  |  |  | 3,973 | 1,073 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 13,672,173 | 13,672,173 |  |  |  |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 714,286 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  | $ 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 |  |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |
Underwritten Public Offering [Member] | October 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Warrants [Member] | IPO [Member] | Series A Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per warrant |  |  |  |  | $ 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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 13,672,173 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity can be converted. + References No definition available. + Details
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- Definition The value as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the share warrants plan. + References No definition available. + Details
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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=109259400&loc=d3e21475-112644 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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=109259400&loc=d3e21475-112644 + Details
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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