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Revenue Recognition
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition During the year ended December 31, 2020, the Company recognized total revenue under license and other agreements of $5.0 million from Advaccine, $1.4 million from its affiliated entity Plumbline Life Sciences, Inc. ("PLS"), and $1.0 million from various other contracts. Of the total revenue recognized during the year ended December 31, 2020, $127,000 was in deferred revenue as of December 31, 2019. During the year ended December 31, 2019, the Company recognized revenue of $293,000 that was included in deferred revenue at December 31, 2018. Performance obligations are generally satisfied within 12 months of the initial contract date.