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Stockholders' Equity - Issuance of Common Stock and Warrants (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 29, 2019 | Jan. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) |  |  |  |  | 539,152 |
Exercise price of common stock (in dollars per share) |  |  | $ 3.50 |  | $ 3.50 |
Amount paid for clearing fees |  | $ 231,000 |  |  |  |
Offering costs |  | 474,000 |  |  |  |
Proceeds from sale of common stock |  | $ 2,300,000 |  |  |  |
Percentage of gross proceeds used to make payments on note |  | 10.00% |  |  |  |
Gross proceeds |  | $ 275,000 |  |  |  |
Payments on the Iliad Note |  |  |  |  | $ 976,000 | $ 0
Proceeds from issuance of warrants |  |  |  |  | 1,900,000 |
Issuance of warrants, January 2020 |  |  | $ (1,555,000) | $ (103,000) | (197,394) |
Proceeds from the exercise of warrants |  |  |  |  | $ 676,000 | $ 0
Note Purchase Agreement |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of gross proceeds used to make payments on note | 10.00% |  |  |  |  |
Payments on the Iliad Note |  | $ 226,000 |  |  |  |
Institutional Investor |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) |  | 688,360 | 497,472 |  |  |
Exercise price of common stock (in dollars per share) |  | $ 3.37 |  |  |  |
Purchase price (in usd per share) |  | 0.625 |  |  |  |
Private Placement |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sale of common stock (in shares) |  |  | 41,680 |  | 48,185 |
Exercise price of common stock (in dollars per share) |  | $ 4.99 | $ 4.9940 |  | $ 4.9940 |
Amount paid for placement agent commissions |  | $ 193,000 |  |  |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  | $ 50,000 |  |  |  |

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