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Preferred Stock Warrant Liability (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 11, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 08, 2013
Preferred Stock Warrant Liability (Details) [Line Items] |  |  |  |  |  |
Loss in fair value of warrant liability |  |  |  | $ 14.6 |  |
Fair value of the outstanding warrants |  | $ 5.1 | $ 7.4 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock Warrant Liability (Details) [Line Items] |  |  |  |  |  |
Warrants expire |  |  |  |  |  | 10 years
Exercise price |  |  |  |  | $ 1.97 |
Shares of warrants exercisable |  |  |  |  | 1,608,670 |
Series C Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock Warrant Liability (Details) [Line Items] |  |  |  |  |  |
Exercise price |  |  |  |  | $ 1.97 |
Shares of warrants exercisable |  |  |  |  | 271,439 |
Percent of fully-diluted equity purchasable upon exercise |  |  |  |  |  | 0.25%
Series D Preferred Stock [Member] |  |  |  |  |  |
Preferred Stock Warrant Liability (Details) [Line Items] |  |  |  |  |  |
Exercise price | $ 1.97 |  |  |  |  |
Shares of warrants exercisable | 320,441 |  |  |  |  |

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