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Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Future Issuance (Detail) - shares	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common shares reserved for future issuance	27,510,704	28,028,978
Stock options
Class of Stock [Line Items]
Common shares reserved for future issuance	1,371,606	830,343
Restricted Stock Units
Class of Stock [Line Items]
Common shares reserved for future issuance	96,974	29,087
Warrant | June 2016 Public Offering
Class of Stock [Line Items]
Common shares reserved for future issuance	421,867	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	6,800,000	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	5,260,000	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	12,243	12,243
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 Equity Incentive Plan
Class of Stock [Line Items]
Common shares reserved for future issuance	318,097	146,488
2014 Employee Stock Purchase Plan
Class of Stock [Line Items]
Common shares reserved for future issuance	6,652	5,895
2015 Inducement Award Plan
Class of Stock [Line Items]
Common shares reserved for future issuance	14,050	14,050

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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

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