Fair Value Measurements - Warrant Liabilities And Convertible Notes At Fair Value (Detail) - Caelum Convertible Notes [Member] |
12 Months Ended |
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Dec. 31, 2018 | |
| Measurement Input, Risk Free Interest Rate [Member] | |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |
| Risk-free interest rate | 2.302% |
| Measurement Input, Expected Dividend Rate [Member] | |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |
| Expected dividend yield | 0.00% |
| Measurement Input, Expected Term [Member] | |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |
| Expected term in years | 3 months 25 days |
| Measurement Input, Price Volatility [Member] | |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | |
| Expected volatility | 67.00% |
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). No definition available.
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. No definition available.
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- Definition Risk-free interest rate assumption used in valuing an instrument. No definition available.
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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. No definition available.
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