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Fair Value Measurements Narrative (Details) - Fair Value, Inputs, Level 1
$ in Millions
Dec. 31, 2019
USD ($)
shares
Marketable Securities and Fair Value Measurements (Textual) [Abstract]  
Number of shares held in an affiliated entity (in shares) 1,644,155
Derivative liability | $ $ 7.1
Common stock  
Marketable Securities and Fair Value Measurements (Textual) [Abstract]  
Number of shares owned (shares) 395,758