Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical)

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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Net unrealized gain on marketable securities, tax expense $ 1,000 $ 3,000 $ 2,000 $ 11,000