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Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Thousands |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2018 | Nov. 23, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 20, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  | $ 704 | $ 262 | $ 0 |
Business acquisition, number of free shares outstanding subject to purchase (in shares) |  |  | 44,000 |  |  |
TxCell S.A. |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Number of ordinary shares acquired (in shares) | 13,519,036 | 11,528,635 |  |  |  |
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Number of free shares held by the holders (in shares) |  |  |  |  |  | 477,000
Business acquisition estimated fair value liabilities of free shares |  |  |  |  |  | $ 200
Number of ordinary shares acquired (in shares) |  |  | 322,000 | 111,000 | 25,047,671 |
Payments to acquire additional interest in subsidiaries |  |  | $ 700 | $ 300 |  |
Increase in fair value of free shares asset and liability |  |  | 100 |  |  |
Business acquisition estimated fair value assets of free shares |  |  | $ 100 |  |  |
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement | Option Pricing Method |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Business acquisition estimated fair value liabilities of free shares | $ 200 |  |  |  |  |

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