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v3.20.4

Subsequent Events (Details) - USD ($) |  |  | 2 Months Ended | 12 Months Ended | 35 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2021 | Jan. 21, 2021 | Feb. 25, 2021 | Dec. 31, 2020 | Dec. 31, 2020 | Feb. 12, 2021 | Mar. 31, 2019 | Aug. 31, 2018 | Feb. 28, 2018
Subsequent event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of stock | $ 60,700,000 |  |  |  |  |  |  |  |
Shares issued upon exercise of warrants |  |  | 801,148 |  |  |  |  |  |
Net proceeds from warrant exercises |  |  | $ 1,800,000 |  |  |  |  |  |
Institutional Purchase Agreement | Subsequent event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold (shares) | 24,906,134 |  |  |  |  |  |  |  |
Price of shares sold (in dollars per share) | $ 2.45 |  |  |  |  | $ 2.45 |  |  |
Number of shares called by warrants issued | 12,453,067 |  |  |  |  | 12,453,067 |  |  |
Warrant exercise price (in dollars per share) | $ 2.90 |  |  |  |  | $ 2.90 |  |  |
Warrants expiration term | 5 years |  |  |  |  | 5 years |  |  |
Additional Purchase Agreement | Subsequent event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold (shares) | 1,632,652 |  |  |  |  |  |  |  |
Price of shares sold (in dollars per share) | $ 2.45 |  |  |  |  | $ 2.45 |  |  |
Number of shares called by warrants issued | 816,326 |  |  |  |  | 816,326 |  |  |
Warrant exercise price (in dollars per share) | $ 2.90 |  |  |  |  | $ 2.90 |  |  |
Warrants expiration term | 5 years |  |  |  |  | 5 years |  |  |
January 2021 Private Placement | Subsequent event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Number of shares sold (shares) |  | 12,500,000 |  |  |  |  |  |  |
Price of shares sold (in dollars per share) |  | $ 2.00 |  |  |  |  |  |  |
Number of shares called by warrants issued |  | 6,250,000 |  |  |  |  |  |  |
Proceeds from issuance of stock |  | $ 25,000,000.0 |  |  |  |  |  |  |
Number of shares per each warrant |  | 1 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  | $ 2.90 |  |  |  |  |  |  |
Warrants expiration term |  | 5 years 6 months |  |  |  |  |  |  |
H.C. Wainwright Sales Amended Agreement |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of stock |  |  |  | $ 8,500,000 | $ 9,500,000 |  |  |  |
Aggregate offering amount authorized per agreement |  |  |  |  |  |  | $ 17,600,000 | $ 25,000,000.0 | $ 25,000,000.0
Stock issued (shares) |  |  |  | 3,558,778 | 3,784,912 |  |  |  |
H.C. Wainwright Sales Amended Agreement | Subsequent event |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of stock |  |  |  |  |  | $ 9,500,000 |  |  |
Stock issued (shares) |  |  |  |  |  | 3,784,912 |  |  |

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