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Fair Value Measurements - Additional Information (Details) - Level 3 | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, maturity date | Jun. 12, 2023 |
Stock Price Volatility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Derivative liabilities, unobservable inputs rate | 56.8 |
Stock Price Volatility | Minimum |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, stock price volatility rate | 73.7 |
Stock Price Volatility | Maximum |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, stock price volatility rate | 78.4 |
Stock Price Volatility | Weighted Average |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, stock price volatility rate | 75.0 |
Weighted Average Expected Term |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, expected term | 2 years 7 months 6 days |
Weighted Average Expected Term | Minimum |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, expected term |  | 1 year 7 months 6 days
Weighted Average Expected Term | Maximum |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Warrant liabilities, expected term |  | 3 years 2 months 12 days
Market Credit Spread |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Derivative liabilities, unobservable inputs rate | 2,063 |
Estimated Yield |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Derivative liabilities, unobservable inputs rate | 21.0 |
Discounts for Lack of Marketability |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior convertible notes, unobservable inputs rate | 12.07 |

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- Definition Value of input used to measure derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -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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- Definition Value of input used to measure long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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