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Revision of Prior Period Financial Statements - Condensed Consolidated Statement of Stockholders’ Equity (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jul. 01, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Accumulated deficit $ (1,046,667)   $ (1,056,369) $ (1,015,201)        
Total stockholders' equity $ 256,022   244,106 $ 279,816 $ 474,549 $ 493,751   $ 741,557
As reported                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Accumulated deficit     (1,051,153)          
Total stockholders' equity     249,322          
Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Accumulated deficit   $ (5,200) (5,216)       $ (5,100)  
Total stockholders' equity     $ (5,216)