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Financings - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 10, 2020 | Feb. 05, 2020 | Jun. 30, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 06, 2021
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock consideration received on transaction |  |  |  | $ 0 | $ 88,661,000 |
Issuance of common stock in connection with at the market offering, net |  |  |  |  | $ 13,015,000 |
Term Loan [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Description of payment terms |  |  |  | Agreement with principal repayments for the Term Loan Agreement starting on September 1, 2023 and a maturity date of August 1, 2025. |  |
Initial term loan |  |  |  |  |  | $ 25,000,000.0
Additonal tranche facility |  |  |  |  |  | $ 25,000,000.0
At The Market Offering [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock issued during period |  |  |  | 0 | 2,814,673 |
Sale of stock consideration received on transaction |  |  |  |  | $ 13,000,000.0 |
par value per share |  |  |  |  | $ 4.77 |
At The Market Offering [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock in connection with at the market offering, net |  |  | $ 100,000,000.0 |  |  |
Underwriting Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock issued during period |  | 27,826,086 |  |  |  |
Issuance & sale of common stock in public offering price per share |  | $ 3.25 |  |  |  |
Sale of stock consideration received on transaction |  | $ 84,800,000 |  |  |  |
par value per share |  | $ 3.055 |  |  |  |
Underwriting Agreement [Member] | Stock Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock issued during period | 1,284,025 |  |  |  |  |
Sale of stock consideration received on transaction | $ 3,900,000 |  |  |  |  |

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