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Stockholders' Equity - Equity Issuances (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 36 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2021 | Jan. 31, 2021 | Mar. 31, 2019 | Aug. 31, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Feb. 12, 2021 | Jun. 04, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 65,000 |  |  |  | $ 85,479 | $ 18,715 |  |
Shares issued upon exercise of warrants |  | 801,148 |  |  |  |  |  |
Net proceeds from warrant exercises |  | $ 1,800 |  |  |  |  |  |
Lincoln Park Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering amount authorized per agreement |  |  | $ 26,000 |  |  |  |  |
Commitment shares issued as consideration per agreement (in shares) |  |  | 181,510 |  |  |  |  |
Number of shares sold (in shares) |  |  | 250,000 |  |  |  |  |
Price of shares sold (in dollars per share) |  |  | $ 4.00 |  |  |  |  |
Gross price for stock transaction |  |  | $ 1,000 |  |  |  |  |
Term of agreement (in months) |  |  | 36 months |  |  |  |  |
Number of shares allowable to direct for Regular Purchase (in shares) |  |  | 100,000 |  |  |  |  |
Maximum obligation per directed purchase transaction for Regular Purchase |  |  | $ 2,500 |  |  |  |  |
Maximum shares allowed in Accelerated Purchase as percent of shares In Regular Purchase (percent) |  |  | 300.00% |  |  |  |  |
Maximum shares allowed in Accelerated Purchase as percent of shares traded during specified period (percent) |  |  | 30.00% |  |  |  |  |
Maximum beneficial ownership allowable per agreement (percent) |  |  | 9.99% |  |  |  |  |
H.C. Wainwright Sales Amended Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering amount authorized per agreement |  |  |  | $ 25,000 |  |  |  |
Commission on gross proceeds due to third party (percent) |  |  |  | 3.00% |  |  |  |
Stock issued (shares) |  |  |  |  | 0 |  | 3,784,912 |
Net proceeds from issuance of common stock |  |  |  |  |  |  | $ 9,500 |
ATM Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate offering amount authorized per agreement |  |  |  |  |  |  |  | $ 50,000
Stock issued (shares) |  |  |  |  | 0 |  |  |
Institutional Purchase Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold (in shares) | 24,906,134 |  |  |  |  |  |  |
Price of shares sold (in dollars per share) | $ 2.45 |  |  |  |  |  |  |
Number of shares called by warrants issued | 12,453,067 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 2.90 |  |  |  |  |  |  |
Warrants expiration term | 5 years |  |  |  |  |  |  |
Additional Purchase Agreement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold (in shares) | 1,632,652 |  |  |  |  |  |  |
Price of shares sold (in dollars per share) | $ 2.45 |  |  |  |  |  |  |
Number of shares called by warrants issued | 816,326 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ 2.90 |  |  |  |  |  |  |
Warrants expiration term | 5 years |  |  |  |  |  |  |
January 2021 Private Placement |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares sold (in shares) |  | 12,500,000 |  |  |  |  |  |
Price of shares sold (in dollars per share) |  | $ 2.00 |  |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 25,000 |  |  |  |  |  |
Number of shares called by warrants issued |  | 6,250,000 |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  | $ 2.90 |  |  |  |  |  |
Warrants expiration term |  | 5 years 6 months |  |  |  |  |  |
Number of shares called by each warrant |  | 1 |  |  |  |  |  |

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