Stockholders' Equity - Equity Offerings (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Apr. 30, 2019 |
Jan. 31, 2019 |
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| Stockholders' Equity | ||||||
| Common stock authorized (in shares) | 200,000,000 | 200,000,000 | ||||
| Preferred stock authorized (in shares) | 5,000,000 | 5,000,000 | ||||
| Net proceeds from the offering | $ 2,792 | |||||
| Warrants outstanding (in shares) | 275,430 | |||||
| Wainwright | ||||||
| Stockholders' Equity | ||||||
| Warrants to purchase shares of common stock | 500,000 | |||||
| Warrants term | 5 years | |||||
| Exercise price (in dollars per share) | $ 1.25 | |||||
| Warrants outstanding (in shares) | 172,500 | |||||
| At-the-market sales facility - April 17, 2019 agreement | Wainwright | Maximum | ||||||
| Stockholders' Equity | ||||||
| Offering amount | $ 50,000 | |||||
| At-the-market sales facility - December 31, 2020 agreement | Wainwright | ||||||
| Stockholders' Equity | ||||||
| Offering amount | $ 50,000 | |||||
| HCW ATM Program | ||||||
| Stockholders' Equity | ||||||
| Net proceeds from the offering | $ 0 | |||||
| Stock available for further issuance | $ 41,900 | |||||
| X | ||||||||||
- Definition Total amount to be received by subsidiary or equity investee for shares of common stock to be issued or sold in the stock transaction. No definition available.
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- Definition The value of shares available for further issuance. No definition available.
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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. No definition available.
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- Definition Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of warrants or rights outstanding. No definition available.
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The cash inflow from the additional capital contribution to the entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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