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Fair Value Measures and Disclosures - Financial Instruments With Significant Level 3 Inputs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Financial Assets  
Fair value, beginning of period $ 0
Progenics acquisition 10,100
Changes in fair value included in net loss 1,200
Fair value, end of period 11,300
Financial Liabilities  
Fair value, beginning of period 0
Progenics acquisition 16,600
Changes in fair value included in net loss (800)
Fair value, end of period 15,800
Change in fair value of the contingent financial asset and contingent financial liabilities $ 2,000