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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Summary of Antidilutive Securities Excluded from Computation of Weighted Average Common Stock Outstanding | The following potentially dilutive shares of common stock have not been included in the computation of diluted net loss per share for all periods as the result would be anti-dilutive:
|  |  |  | December 31, |
|  |  |  | 2019 |  |  | 2018 |
Warrants to purchase Series C-1 Preferred |  |  |  |  | — |  |  |  | 14,033 |
Warrants to purchase common stock associated with Solar loan agreement |  |  |  |  | 122,435 |  |  |  | 122,435 |
Warrants to purchase common stock associated with June 2016 public offering |  |  |  |  | 4,218,750 |  |  |  | 4,218,750 |
Warrants to purchase common stock associated with March 2018 Public Offering - Series 1 |  |  |  |  | — |  |  |  | 13,198,075 |
Warrants to purchase common stock associated with March 2018 Public Offering - Series 2 |  |  |  |  | 7,988,175 |  |  |  | 7,988,175 |
Outstanding stock options |  |  |  |  | 5,261,860 |  |  |  | 4,052,913 |
Outstanding restricted stock units |  |  |  |  | 966,394 |  |  |  | 111,891 |
Common stock associated with 6% convertible senior notes |  |  |  |  | 11,382,000 |  |  |  | — |
Warrants to purchase common stock associated with December 2019 Public Offering |  |  |  |  | 44,722,222 |  |  |  | — |
Option to purchase common stock associated with December 2019 Public Offering |  |  |  |  | 5,833,333 |  |  |  | — |
Total |  |  |  |  | 80,495,169 |  |  |  | 29,706,272 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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