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Fair Value Measurement - Summary of Estimated Fair Value of Free Share Liability Assumptions (Detail) | 12 Months Ended |  |
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Dec. 31, 2018 $ / shares | Dec. 31, 2018 € / shares | Oct. 01, 2018 $ / shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock Price (USD) | $ 11.48 |  |
EUR/ USD Exchange Rate | 0.873 | 0.873 |
Stock Price Volatility Estimate [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 79.90 | 79.90 |
Exchange Rate Volatility Estimate [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 7.66 | 7.66 |
Risk Free Rate [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Risk Free Rate | Varies by expected exercise date |  |
TxCell S.A. [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Stock Price (EUR) | (per share) | $ 2.94 | € 2.58 | $ 2.99
TxCell S.A. [Member] | Stock Price Volatility Estimate [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Volatility Estimate | 8.59 | 8.59 |

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