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Fair Value Measurement - Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 01, 2018 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 € / shares | Oct. 01, 2018 € / shares shares
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Number of free shares held by the holders | 477,000,000 |  |  | 477,000,000
TxCell S.A. [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Free shares options purchase price per share | (per share) | $ 2.99 | $ 2.94 | € 2.58 |
TxCell S.A. [Member] | Share Purchase Agreement and Tender Offer Agreement [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Number of free shares held by the holders | 477,000 |  |  | 477,000
Free shares options purchase price per share | (per share) | $ 2.99 |  |  | € 2.58
Exchange rate on purchase price | 1.16 |  |  |
Changes in fair value of free share liability | $ |  | $ 0 |  |

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