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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Detail) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 20,473,931 | 6,594,117 | 15,172,265 | 7,741,317
Outstanding stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 1,643,506 | 808,855 | 1,643,506 | 817,855
Outstanding restricted stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 149,134 | 80,137 | 149,134 | 80,137
Warrants to purchase common stock associated with June 2016 Public Offering | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 0 | 421,867 | 0 | 421,867
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
December 2019 Public Offering | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 4,472,205 | 4,472,205 | 4,472,205 | 4,472,205
December 2020 Public Offering Series 1 | Warrant |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities (in shares) | 6,439,866 | 0 | 0 | 0
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 | 0 | 6,800,000 | 0
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) | 170,410 | 0 | 170,410 | 0
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) | 0 | 0 | 1,138,200 | 1,138,200

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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 http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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