Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details)

v3.20.2
Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Mar. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Apr. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Recognition of total right-of-use assets       $ 42,571    
Total operating lease liabilities       47,128    
Cumulative effects adjustment for ASU 2016-02 adoption     $ 961,497 1,022,912 $ 988,577  
Derecognized deferred rent $ (3,400) $ (6,700)        
Accounting Standards Update 2016-02            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Recognition of total right-of-use assets     50,600      
Total operating lease liabilities     50,700      
Derecognized deferred rent     3,300      
Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effects adjustment for ASU 2016-02 adoption     306      
Accumulated Deficit            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effects adjustment for ASU 2016-02 adoption     (594,026) $ (563,376) $ (580,855)  
Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effects adjustment for ASU 2016-02 adoption     $ 306     $ 300