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Stockholders' Equity - Securities Purchase Agreements (Details) - USD ($) |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2020 | Jun. 15, 2020 | May 26, 2020 | May 14, 2020 | May 14, 2020 | May 11, 2020 | May 08, 2020 | Apr. 09, 2020 | Mar. 30, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) | 6,500,000 |  | 1,205,400 | 146,854 |  | 447,761 |  | 904,970 | 800,000 |  |
Number of shares called by warrants (in shares) |  | 2,213,115 |  |  |  |  |  |  |  |  |
Months until exercisable |  | 6 months |  |  |  |  | 6 months |  |  |  |
Exercise price of warrants (in dollars per share) |  | $ 3.05 |  |  |  |  |  |  |  | $ 0.01 |
Expiration term |  | 5 years 6 months |  |  |  |  |  |  |  |  |
Gross proceeds | $ 100,900,000 |  | $ 2,500,000 |  | $ 810,000 |  |  | $ 1,100,000 | $ 1,000,000.0 |  |
Offering price (in dollars per share) | $ 13.50 |  |  | $ 1.43 | $ 1.43 | $ 1.34 |  |  |  |  |
Net proceeds | $ 94,000,000.0 |  |  |  |  |  |  |  |  | $ 112,299,949 | [1]
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) | 975,000 |  |  |  |  |  |  |  |  |  |
Series I Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares called by warrants (in shares) |  |  |  |  |  |  |  |  | 131,967 |  |
Series J Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securities called by each warrant (in shares) |  |  |  |  |  |  |  |  | 1 |  |
Months until exercisable |  |  |  |  |  |  |  |  | 6 months |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.948 |  |
Expiration term |  |  |  |  |  |  |  |  | 5 years 6 months |  |
Series K Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares called by warrants (in shares) |  |  |  |  |  |  |  | 255,000 |  |  |
Series L Warrants |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securities called by each warrant (in shares) |  |  |  |  |  |  |  | 1 |  |  |
Months until exercisable |  |  |  |  |  |  |  | 6 months |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  | $ 0.81 |  |  |
Expiration term |  |  |  |  |  |  |  | 5 years 6 months |  |  |
Series M Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares called by warrants (in shares) |  |  | 482,160 |  |  |  |  |  |  |  |
Months until exercisable |  |  | 6 months |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 2.024 |  |  |  |  |  |  |  |
Expiration term |  |  | 5 years 6 months |  |  |  |  |  |  |  |
[1] | Net of expenses of $7,507,123, and fair value of warrants issued as a transaction advisory fee as of the date of issuance of $370,666

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