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Fair Value Measurements - Summary of Financial Instruments Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | $ 20,526 | $ 42,193
Fair value of financial liabilities | 16,120 | 21,588
Warrant liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 13,628 | 18,396
Derivative liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 2,492 | 3,192
Cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 195 | 23
Restricted cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 273 | 273
Money market funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 20,058 | 41,897
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 20,526 | 42,193
Fair value of financial liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 195 | 23
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 273 | 273
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 20,058 | 41,897
Significant Other Observable Inputs (Level 2) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Fair value of financial liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) | Warrant liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) | Derivative liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Significant Other Observable Inputs (Level 2) | Cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Restricted cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Fair value of financial liabilities | 16,120 | 21,588
Significant Unobservable Inputs (Level 3) | Warrant liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 13,628 | 18,396
Significant Unobservable Inputs (Level 3) | Derivative liability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial liabilities | 2,492 | 3,192
Significant Unobservable Inputs (Level 3) | Cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Restricted cash |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Fair value of financial assets | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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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