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Related Party Transactions - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | May 26, 2017 USD ($) ft² | May 31, 2017 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Oct. 13, 2018 USD ($) | Jan. 09, 2013 ft²
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party transaction, due to related party |  |  |  |  |  |  |  |  |  | $ 200,000 |
Related party transaction, expenses from transactions with related party |  |  |  | $ 50,000 |  | $ 150,000 |  |  |  |  |
Related Party Costs |  |  |  |  |  | 50,000 |  |  |  |  |
Member of Board of Directors |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Legal fees |  |  |  | 117,000 | $ 116,000 | 353,000 | $ 335,000 |  |  |  |
Accounts payable to related party |  |  |  | $ 78,230 |  | $ 78,230 |  |  |  |  |
MacAndrews & Forbes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  |  |  |  |  |  |  |  |  |  | 6,676
Rent expense, sublease rentals, net | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Rent expense, sublease rentals, estimate | 2,400,000 |  |  |  |  |  |  |  |  |  |
New HQ Lease | MacAndrews & Forbes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, term (years) |  | 10 years |  |  |  |  |  |  |  |  |
Area of real estate property (in sq ft) | ft² |  | 3,200 |  |  |  |  |  |  |  |  |
Monthly rental payments for initial period |  | $ 25,333 |  |  |  |  |  |  |  |  |
Monthly rental payments after initial period |  | 29,333 |  |  |  |  |  |  |  |  |
Additional facility fee |  | $ 3,333 |  |  |  |  |  |  |  |  |
Facility fee annual increase, percent |  |  | 500.00% |  |  |  |  |  |  |  |
Facility fee after initial period |  |  | $ 0 |  |  |  |  |  |  |  |
Old HQ Subleas |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business exit cost |  |  |  |  |  |  |  | $ 1,100,000 |  |  |
Write down of leasehold improvements and furniture |  |  |  |  |  |  |  |  | $ 100,000 |  |
Old HQ Subleas | MacAndrews & Forbes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Monthly rental payments for initial period | 60,000 |  |  |  |  |  |  |  |  |  |
Monthly rental payments after initial period | 63,400 |  |  |  |  |  |  |  |  |  |
Rent discrepancy, sublease rentals | 1,100,000 |  |  |  |  |  |  |  |  |  |
Replacement M&F Sublease | MacAndrews & Forbes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Monthly rental payments for initial period | 36,996 |  |  |  |  |  |  |  |  |  |
Monthly rental payments after initial period | $ 37,831 |  |  |  |  |  |  |  |  |  |
Free rent period | 2 months |  |  |  |  |  |  |  |  |  |
Initial rent period | 12 months |  |  |  |  |  |  |  |  |  |
Monthly rental payments after secondary period | $ 38,665 |  |  |  |  |  |  |  |  |  |
Rent expense, sublease rentals | $ 900,000 |  |  |  |  |  |  |  |  |  |

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