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Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Intangible Assets, Net | Intangible assets are related to certain capitalized milestone and sublicense payments. The following table presents intangible assets (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Intangible assets |  | $ | 19,773 |  |  | $ | 2,500 |
Less accumulated amortization |  |  | (8,056 | ) |  |  | (1,194 | )
Total |  | $ | 11,717 |  |  | $ | 1,306 |

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