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Summary of Significant Accounting Policies - Accounting Standards Adopted (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Oct. 01, 2019
Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Prepaid expenses and other current assets $ 8,350       $ 7,816       $ 8,350 $ 7,816     $ 8,487
Other assets 12,136       14,124       12,136 14,124     14,183
Accumulated deficit (118,572)       (100,045)       (118,572) (100,045)     (99,315)
Total revenue from operations 58,790 $ 56,882 $ 56,800 $ 54,053 $ 52,705 $ 50,569 $ 60,097 $ 61,143 226,525 224,514 $ 270,015    
Decrease in general and administrative expense from reclassification                 34,249 30,493 36,079    
Decrease in interest and other income, net                 1,448 785 606    
Fee revenue                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Total revenue from operations                 78,636 74,837 81,445    
Accounting Standards Update 2017-07                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Decrease in general and administrative expense from reclassification                 (347) (335) (244)    
Decrease in interest and other income, net                 (347) $ (335) $ (244)    
Accounting Standards Update 2016-02 | Scenario, Forecast | Minimum                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Incremental borrowing rate                       6.00%  
Operating right-of-use assets                       $ 11,000  
Operating lease liability                       $ 12,000  
Accounting Standards Update 2016-02 | Scenario, Forecast | Maximum                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Incremental borrowing rate                       7.00%  
Operating right-of-use assets                       $ 12,500  
Operating lease liability                       $ 13,500  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Prepaid expenses and other current assets 506               506       671
Other assets 309               309       59
Accumulated deficit (815)               (815)       $ 730
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Fee revenue                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Total revenue from operations                 (353)        
Balance without adoption of ASC 606                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Prepaid expenses and other current assets 7,844               7,844        
Other assets 11,827               11,827        
Accumulated deficit $ (117,757)               (117,757)        
Balance without adoption of ASC 606 | Fee revenue                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Total revenue from operations                 $ 78,989