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Acquisition of Txcell S.A. - Summary of Estimated Fair Value of Net Assets Acquired (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Fair value of non-controlling interest |  |  | $ 35,829 | $ 35,829 |
Goodwill |  |  | 40,044 | 40,044 | $ 39,795
TxCell S.A. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration transferred | $ 45,911 | $ 45,900 | $ 33,900 | $ 80,400 |
Fair value of non-controlling interest | 35,829 |  |  |  |
Fair value of TxCell | 81,740 |  |  |  |
Cash | 4,779 |  |  |  |
Current assets | 2,427 |  |  |  |
Property and equipment | 1,857 |  |  |  |
IPR&D | 55,019 |  |  |  |
Other assets | 155 |  |  |  |
Current liabilities | (9,761) |  |  |  |
Assumed debt liabilities | (4,933) |  |  |  |
Deferred tax liability, net | (6,798) |  |  |  |
Fair value of net identifiable assets acquired | 42,745 |  |  |  |
Goodwill | 38,995 |  |  |  |
Total fair value of net assets acquired | $ 81,740 |  |  |  |

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