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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Detail) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 24,419,347 | 27,139,760 | 24,419,347 | 27,139,760
Outstanding stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 1,970,536 | 2,129,002 | 1,970,536 | 2,129,002
Outstanding restricted stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 400,000 | 1,024,929 | 400,000 | 1,024,929
March 2018 Public Offering Series 2 | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 798,810 | 0 | 798,810
December 2020 Public Offering Series 2 | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 6,800,000 | 6,800,000 | 6,800,000 | 6,800,000
April 2022 Public Offering | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 15,000,000 | 15,000,000 | 15,000,000 | 15,000,000
Warrants to purchase common stock associated with Loan Agreement | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 198,811 | 198,819 | 198,811 | 198,819
Common stock associated with March 2019 Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 1,138,200 | 0 | 1,138,200
Warrants to purchase common stock associated with Danforth | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 50,000 | 50,000 | 50,000 | 50,000

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + 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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