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Fair Value Measurements - Summary of Estimated Fair Value of Free Shares Valuation Assumptions (Detail) | Jun. 30, 2019 $ / shares € / shares | Dec. 31, 2018 $ / shares € / shares
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Stock Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | $ / shares | 9.65 | 11.48
Exchange Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | 0.89 | 0.87
Stock Price Volatility Estimate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | 77.6 | 79.9
EUR / USD Exchange Rate Volatility Estimate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | 7.0 | 7.7
TxCell S.A. | Stock Price |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | € / shares | 2.24 | 2.58
TxCell S.A. | Stock Price Correlation |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | 72.2 | 0
TxCell S.A. | Stock Price Volatility Estimate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Free shares measurement input | 76.2 | 8.6

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