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Balance Sheet Account Detail - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Related Disclosures [Abstract]      
Depreciation $ 3.3 $ 3.7 $ 5.0
Amortization of intangible assets $ 3.6 $ 4.2 $ 4.1