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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The change in the carrying amounts of goodwill for the three months ended March 31, 2019 was as follows (in thousands):
|  | Amount |
Balance at December 31, 2018 |  | $ | 51,967 |
Currency translation adjustments |  |  | (722 | )
Balance at March 31, 2019 |  | $ | 51,245 |
Schedule of Identifiable Intangible Assets | Purchased intangible assets consisted of the following as of March 31, 2019 and December 31, 2018 (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proprietary adjuvant technology |  | $ | 8,026 |  |  | $ | (2,274 | ) |  | $ | 5,752 |  |  | $ | 8,357 |  |  | $ | (2,263 | ) |  | $ | 6,094 |
Collaboration agreements |  |  | 3,624 |  |  |  | (3,262 | ) |  |  | 362 |  |  |  | 3,773 |  |  |  | (3,326 | ) |  |  | 447 |
Total identifiable intangible assets |  | $ | 11,650 |  |  | $ | (5,536 | ) |  | $ | 6,114 |  |  | $ | 12,130 |  |  | $ | (5,589 | ) |  | $ | 6,541 |
Schedule of Estimated Amortization Expense | Estimated amortization expense for existing intangible assets for the remainder of 2019 and for each of the five succeeding years ending December 31 will be as follows (in thousands):
Year |  | Amount |
2019 (remainder) |  | $ | 505 |
2020 |  |  | 560 |
2021 |  |  | 401 |
2022 |  |  | 401 |
2023 |  |  | 401 |
2024 |  |  | 401 |

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