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Stockholders' Equity - Schedule of Reserved Shares of Common Stock for Future Issuance (Detail) - shares | Dec. 31, 2019 | Dec. 31, 2018
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Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 81,439,674 | 30,404,957
6.0% Convertible Senior Notes due 2025 |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 11,382,000 | 0
2014 Equity Incentive Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 554,774 | 612,018
2014 Employee Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 74,231 | 81,667
2015 Inducement Plan |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 315,500 | 5,000
Series C1 Preferred Warrants |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 14,033
June 2016 Public Offering | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 4,218,750 | 4,218,750
March 2018 Public Offering | Series 1 Warrant |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 0 | 13,198,075
March 2018 Public Offering | Series 2 Warrant |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 7,988,175 | 7,988,175
December 2019 Public Offering | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 44,722,222 | 0
December 2019 Public Offering | Option to Purchase Common Stock |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 5,833,333 | 0
Warrants to purchase common stock associated with Solar loan agreement | Warrant liability |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 122,435 | 122,435
Stock options |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 5,261,860 | 4,052,913
Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Common shares reserved for future issuance | 966,394 | 111,891

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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=6877327&loc=d3e13212-122682 + Details
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