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Warrants to Purchase Common Stock - Measurement Inputs (Details) | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Dividend yield |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.0000 |  | 0.0000
Expected volatility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.4993 |  | 0.4993
Risk-free interest rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.0031 |  | 0.0017
Common Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant term (in years) |  | 4 years | 5 years
September 2020 Common Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant term (in years) |  |  | 5 years
September 2020 Common Stock Warrants | Dividend yield |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) |  |  | 0.000
September 2020 Common Stock Warrants | Expected volatility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) |  |  | 0.500
September 2020 Common Stock Warrants | Risk-free interest rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) |  |  | 0.003
March 2021 Common Stock Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant term (in years) | 4 years |  |
March 2021 Common Stock Warrants | Dividend yield |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.000 |  |
March 2021 Common Stock Warrants | Expected volatility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.500 |  |
March 2021 Common Stock Warrants | Risk-free interest rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement input (percent) | 0.006 |  |

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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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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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