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Acquisition of Txcell S.A. - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2018 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2019 € / shares | Dec. 31, 2018 € / shares shares | Oct. 01, 2018 € / shares | Jul. 20, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price per share | $ / shares | $ 2.99 |  |  |  |  |  |  |
Goodwill impairments |  | $ 0 |  | $ 0 |  |  |  |
Number of shares not purchased by the acquirer | shares | 11,981,867 |  |  |  |  |  |  |
TxCell S.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition date |  | Oct. 01, 2018 |  |  |  |  |  |
Number of ordinary shares acquired | shares | 13,519,036 |  | 11,528,635 |  |  |  |  |
Percentage of share capital and voting rights acquired |  |  | 98.20% | 98.20% |  | 98.20% |  |
Number of remaining outstanding share owned by sellers | shares |  | 453,000 | 453,000 | 453,000 |  | 453,000 |  |
Purchase price per share | (per share) | $ 2.99 |  | $ 2.94 | $ 2.94 | € 2.36 | € 2.58 |  |
Loan deemed to be part of purchase consideration | $ 5,200,000 |  |  |  |  |  |  |
Cash paid to ordinary shares acquired | 40,500,000 |  |  |  |  |  |  |
Fair value of consideration payable | 200,000 | $ 700,000 |  |  |  |  |  |
Purchase consideration | $ 45,911,000 |  | $ 33,900,000 | $ 80,400,000 |  |  |  |
Fair value percentage at acquirer recognizes and consolidates assets acquired, liabilities assumed, and any non-controlling interest | 100.00% |  |  |  |  |  |  |
Consideration payable | $ 45,911,000 |  | $ 33,900,000 | $ 80,400,000 |  |  |  |
TxCell S.A. [Member] | SPA and TOA [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interests agreed to acquire |  |  |  |  |  |  |  | 100.00%
Number of free shares held by the holders | shares | 477,000 |  |  |  |  |  |  |
Purchase price per share | (per share) | $ 2.99 |  |  |  |  |  | € 2.58 |
Exchange rate on purchase price | 0.0116 |  |  |  |  |  |  |
Estimated fair value asset of free shares |  | $ 400,000 |  |  |  |  |  |
TxCell S.A. [Member] | SPA and TOA [Member] | Option Pricing Method [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated fair value liability of free shares | $ 200,000 |  |  |  |  |  |  |
TxCell S.A. [Member] | SPA and TOA [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price per share | € / shares |  |  |  |  |  |  | € 2.58 |
TxCell S.A. [Member] | SPA [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of ordinary shares acquired | shares | 13,519,036 |  |  |  |  |  |  |
Percentage of share capital and voting rights acquired | 53.00% |  |  |  |  |  |  |

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