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Subsequent Events
12 Months Ended
Dec. 31, 2018
Subsequent Events [Abstract]  
Subsequent Events

(22)

Subsequent Events

On February 28, 2019, the Joint Research Committee related to the Company’s collaboration with AbbVie concluded that the remaining milestone of $2.5 million under the Second Amendment in the Company’s collaboration with AbbVie was achieved. Related revenue will be recognized as the research and development services are provided using an input method, according to the full time equivalents incurred over the third phase of the research plan.