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Stockholders' Equity - Series E Convertible Preferred Stock (Details) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
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Jun. 15, 2020 | May 26, 2020 | May 14, 2020 | May 11, 2020 | Apr. 09, 2020 | Mar. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | May 08, 2020 | Dec. 31, 2019 | Jan. 25, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) |  | 1,205,400 | 146,854 | 447,761 | 904,970 | 800,000 |  |  |  |  |  |  |  |
Number of shares called by warrants (in shares) | 2,213,115 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in USD per share) | $ 3.05 |  |  |  |  |  |  |  |  |  |  |  |  |
Months until exercisable | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) | 184,426 |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration term | 5 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants, fair value | $ 370,666 |  |  |  |  |  |  | $ 370,666 |  |  |  |  |  |
Series N Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in USD per share) | $ 2.39 |  |  |  |  |  |  |  |  |  |  |  |  |
Months until exercisable | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Series E Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ 10 |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  |  |  |
Conversion price (in dollars per share) | $ 2.44 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  | 865,824 |  |  | 865,824 |  |  | 0 |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 2,664,717 | $ 0 |  |  |
Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of 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 USD per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1.50 |  | $ 3.762
Private Placement | Series E Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, number of shares issued (in shares) | 865,824 |  |  |  |  |  |  |  |  |  |  |  |  |

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