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Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Future Issuance (Detail) - shares | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 25,231,971 | 28,028,978
Stock options |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 1,643,506 | 830,343
Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 149,134 | 29,087
Warrant | June 2016 Public Offering |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 421,867
Warrant | December 2019 Public Offering |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 4,472,205 | 4,472,205
Warrant | December 2020 Public Offering Series 1 |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 6,439,866 | 6,800,000
Warrant | December 2020 Public Offering Series 2 |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 6,800,000 | 6,800,000
Warrant | Prefunded Warrants to Purchase Common Stock Associated with December 2020 Public Offering |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 3,200,000 | 5,260,000
Warrant | Warrants to purchase common stock associated with Solar loan agreement |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 12,243
Warrant | Warrants to purchase common stock associated with Loan Agreement |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 170,410 | 0
Series 1 Warrant | March 2018 Public Offering |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 798,810 | 798,810
March 2019 Notes |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 1,138,200 | 1,138,200
April 2020 Notes |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 1,299,790
2014 Employee Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 3,893 | 5,895
2014 Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 184,497 | 146,488
2015 Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 231,450 | 14,050

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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