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Fair Value Measurements - Additional Information (Details) - shares | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Class Of Warrant Or Right [Line Items] |  |  |
Number of warrants outstanding (in shares) | 4,236,687 | 1,826,608 |
Febuary 2018 Warrants [Member] |  |  |
Class Of Warrant Or Right [Line Items] |  |  |
Number of warrants outstanding (in shares) |  |  | 179

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |