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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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