Fair Value Measurements - Changes in Fair Value of Financial Instruments (Detail) - Caelum [Member] $ in Thousands |
3 Months Ended |
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Mar. 31, 2019
USD ($)
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Balance | $ 10,905 |
| Balance | 0 |
| Caelum Convertible Notes [Member] | |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Balance | 9,914 |
| Conversion of the convertible notes | (9,914) |
| Balance | $ 0 |
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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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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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