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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares (Details) - shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 76,980,858 | 30,769,732
Warrant liability |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 44,722,222 | 0
Outstanding stock options |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 7,684,762 | 5,310,498
Outstanding restricted stock units |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 862,514 | 107,841
Warrants to purchase Series C-1 Preferred | Warrant liability |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 0 | 14,033
Warrants to purchase common stock associated with Solar loan agreement | Warrant liability |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 122,435 | 122,435
Warrants to purchase common stock associated with June 2016 Public Offering | Warrant liability |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 4,218,750 | 4,218,750
March 2018 Public Offering Series 2 [Member] | Warrant liability |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 7,988,175 | 7,988,175
Common stock associated with 6% convertible senior notes |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Anti-dilutive securities (in shares) | 11,382,000 | 13,008,000

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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://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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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