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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 |  |  |  |

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