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Revenue Recognition
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition During the three and nine months ended September 30, 2021, the Company recognized total revenue under collaborative research and development arrangements of $95,000 and $220,000, respectively, from its affiliated entity Plumbline Life Sciences, Inc. ("PLS") and $196,000 and $716,000, respectively, from various other contracts as a result of performance obligations being satisfied. Of the total revenue recognized during the three and nine months ended September 30, 2021, $4,000 and $42,000, respectively, were in deferred revenue as of December 31, 2020.