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Restatement of Consolidated Financial Statements - Consolidated Statement of Stockholders' Equity (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Error correction and prior-period adjustments            
Total stockholders’ equity $ 847,843 $ 830,588 $ 912,706 $ 965,828 $ 972,730 $ 975,373
As originally reported            
Error correction and prior-period adjustments            
Total stockholders’ equity       958,246    
Adjustments            
Error correction and prior-period adjustments            
Total stockholders’ equity       7,582    
Accumulated deficit            
Error correction and prior-period adjustments            
Total stockholders’ equity $ (422,737) $ (426,413) $ (357,751) (314,205) $ (301,468) $ (285,789)
Accumulated deficit | As originally reported            
Error correction and prior-period adjustments            
Total stockholders’ equity       (321,787)    
Accumulated deficit | Adjustments            
Error correction and prior-period adjustments            
Total stockholders’ equity       $ 7,582