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Stockholders' Equity - Securities Purchase Agreements (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2020 | May 26, 2020 | May 14, 2020 | May 14, 2020 | May 11, 2020 | Apr. 09, 2020 | Mar. 30, 2020 | Nov. 30, 2021 | May 31, 2021 | Dec. 31, 2021 | [1] | Dec. 31, 2020 | [2]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds | $ 100,900 | $ 2,500 |  | $ 810 |  | $ 1,100 | $ 1,000 | $ 15,000 | $ 20,000 |  |
Sale of stock, shares issued (in shares) | 6,500,000 |  | 146,854 |  | 447,761 |  |  | 2,400,000 | 2,000,000 |  |
Offering price (in dollars per share) | $ 13.50 |  | $ 1.43 | $ 1.43 | $ 1.34 |  |  |  |  |  |
Net proceeds | $ 94,000 |  |  |  |  |  |  |  |  | $ 34,187 | $ 112,300
Number of days counterparty cannot sell or transfer shares |  |  |  |  |  |  |  | 180 days |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  | 1,205,400 |  |  |  | 904,970 | 800,000 |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) | 975,000 |  |  |  |  |  |  |  |  |  |
Pre-Funded Warrants |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  |  | 255,000 | 131,967 |  |  |  |
Series J Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  |  |  | 931,967 |  |  |  |
Series L Warrants |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  |  | 1,159,970 |  |  |  |  |
Series M Warrant |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  | 482,160 |  |  |  |  |  |  |  |  |
[1] | Net of expenses of $0.8 million.
[2] | Net of expenses of $7.5 million, and fair value of warrants issued as a transaction advisory fee as of the date of issuance of $0.4 million.

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- Definition Securities Purchase Agreement, Number Of Days Counterparty Cannot Sell Or Transfer Shares + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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