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Debt (Senior Secured Debenture) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 05, 2018 | May 10, 2016 | Nov. 14, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Oct. 16, 2018 | Sep. 24, 2018 | Jul. 16, 2018 | May 18, 2018 | Dec. 29, 2017 | Aug. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  |  |  |  |  |  | 11,520,000 |  | 316,163 |
Outstanding principal |  |  |  |  |  |  |  | $ 10,200,000 |  |  |  |  |  |
Principal redeemed |  |  |  |  |  | $ 2,800,000 |  |  |  |  |  |  |  |
Debt instrument, redemption, principal amount redeemed, shares |  |  |  | 659,529 |  | 659,529 |  |  |  |  |  |  |  |
Debt amount redeemed, settled in cash |  |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |
Decrease in restricted cash |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | $ 766,000 | $ 0 | 766,000 | $ 0 |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed coupon rate |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  | $ 8,500,000 |  |  |  |
Balance of restricted cash over senior secured debenture |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |
Securities Purchase Agreement | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed coupon rate |  | 6.375% |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt |  | $ 25,530,000 |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued (in shares) |  | 3,333 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt and warrants |  | $ 23,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Amendment Agreement | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final payment of interest |  |  |  |  |  | $ 800,000 |  | 800,000 |  |  |  |  |  |
Debt instrument, covenant, compensating cash balance |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  | $ 18,500,000
Restricted cash |  |  |  |  |  |  |  | $ 10,200,000 |  |  |  | $ 8,500,000 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit of restricted cash over senior secured debenture |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |
JGB Action | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of restricted cash over senior secured debenture | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, damages awarded, value | 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on reimbursement of legal fees | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt | $ 800,000 |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |

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