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Condensed Consolidated Statements of Operations and Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Unrealized gain on investment, tax $ 0 $ 0 $ 0 $ 0