Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2009
Fair Value Disclosures [Abstract]    
Investment owned, balance (in shares) 10,000,000 10,000,000
Investment owned, at fair value $ 0  
Unrealized gain (loss) $ (500,000)