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Revenue Recognition
3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition During the three months ended March 31, 2022 and 2021, the Company recognized total revenue under collaborative research and development arrangements of $9,000 and $50,000, respectively, from its affiliated entity Plumbline Life Sciences, Inc. ("PLS") and $190,000 and $321,000, respectively, from various other contracts as a result of performance obligations being satisfied. Of the total revenue recognized during the three months ended March 31, 2022, $10,000 was in deferred revenue as of December 31, 2021.