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Selected Quarterly Financial Information (Parenthetical) (Details) - shares
shares in Thousands
3 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]            
Anti-dilutive potential common share equivalents 1,168 730 740 1,048 1,028 1,870