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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Detail) - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 27,139,760 | 15,133,722 | 27,139,760 | 15,133,722
Outstanding stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 2,129,002 | 1,607,080 | 2,129,002 | 1,607,080
Outstanding restricted stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 1,024,929 | 134,774 | 1,024,929 | 134,774
Warrants to purchase common stock associated with December 2019 Public Offering | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 4,472,205 | 0 | 4,472,205
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 | 0 | 15,000,000 | 0
March 2018 Public Offering Series 2 | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 798,810 | 798,810 | 798,810 | 798,810
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) | 198,819 | 170,410 | 198,819 | 170,410
Warrants to purchase common stock associated with Solar loan agreement | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 12,243 | 0 | 12,243
Common stock associated with March 2019 Notes |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 1,138,200 | 1,138,200 | 1,138,200 | 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 | 0 | 50,000 | 0

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