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Stockholders' Equity - Series E Convertible Preferred Stock (Details) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2020 | Jun. 15, 2020 | May 26, 2020 | May 14, 2020 | May 11, 2020 | May 08, 2020 | Apr. 09, 2020 | Mar. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 25, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) | 6,500,000 |  | 1,205,400 | 146,854 | 447,761 |  | 904,970 | 800,000 |  |  |  |
Number of shares called by warrants (in shares) |  | 2,213,115 |  |  |  |  |  |  |  |  |  |
Months until exercisable |  | 6 months |  |  |  | 6 months |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  | $ 3.05 |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Shares issued upon conversion (in shares) |  |  |  |  |  |  |  |  | 863,852 | 863,852 |  |
Class Of Warrant Or Right, Issued |  | 184,426 |  |  |  |  |  |  |  |  |  |
Deemed dividend recognized on beneficial conversion features of convertible preferred stock |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |
Expiration term |  | 5 years 6 months |  |  |  |  |  |  |  |  |  |
Warrants, Fair Value |  | $ 370,666 |  |  |  |  |  |  |  | $ 370,666 |  |
Series N Warrant |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Months until exercisable |  | 6 months |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  | $ 2.39 |  |  |  |  |  |  |  |  |  |
Series E Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  | $ 2.44 |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) |  |  |  |  |  |  |  |  | 210,780 |  |  |
Deemed dividend recognized on beneficial conversion features of convertible preferred stock |  |  |  |  |  |  |  |  |  | $ 2,664,717 | $ 0 |
Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  | 1,984,328 |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares called by warrants (in shares) |  |  |  |  |  | 859,813 |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 1.50 |  |  |  |  |  | $ 3.762
Private Placement | Series E Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  | 865,824 |  |  |  |  |  |  |  |  |  |

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