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Fair Value Measurements - Summary of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Liabilities: |  |
Warrant liabilities | $ 32,767 | $ 41,549
Recurring |  |
Assets: |  |
Total | 30,574 | 50,401
Liabilities: |  |
Warrant liabilities | 32,767 | 41,549
Total | 32,767 | 41,549
Recurring | (Level 1) |  |
Assets: |  |
Total | 30,574 | 50,401
Liabilities: |  |
Warrant liabilities | 0 | 0
Total | 0 |
Recurring | (Level 2) |  |
Assets: |  |
Total | 0 | 0
Liabilities: |  |
Warrant liabilities | 0 | 0
Total | 0 | 0
Recurring | (Level 3) |  |
Assets: |  |
Total | 0 | 0
Liabilities: |  |
Warrant liabilities | 32,767 | 41,549
Total | 32,767 | 41,549
Recurring | Money market funds |  |
Assets: |  |
Cash and cash equivalents, fair value disclosure | 30,574 | 50,401
Recurring | Money market funds | (Level 1) |  |
Assets: |  |
Cash and cash equivalents, fair value disclosure | 30,574 | 50,401
Recurring | Money market funds | (Level 2) |  |
Assets: |  |
Cash and cash equivalents, fair value disclosure | 0 | 0
Recurring | Money market funds | (Level 3) |  |
Assets: |  |
Cash and cash equivalents, fair value disclosure | $ 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 Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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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