Annual report pursuant to Section 13 and 15(d)

Cash, Cash Equivalents and Investments - Narrative (Details)

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Cash, Cash Equivalents and Investments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Abstract]    
Realized gain (loss) on investments $ 0.3 $ 1.0