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Debt - Senior Secured Debenture (Details) - USD ($)				12 Months Ended
	Nov. 10, 2018	Nov. 05, 2018	May 10, 2016	Dec. 31, 2018	Dec. 31, 2017	Jul. 16, 2018	May 18, 2018	Dec. 29, 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
Debt amount redeemed, settled in cash				$ 600,000
Decrease in restricted cash				1,800,000
Gain on extinguishment of debt				766,000	0
Securities Purchase Agreement | Secured Debt
Debt Instrument [Line Items]
Fixed coupon rate	9.00%		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
Restricted cash					$ 10,200,000		$ 8,500,000
JGB Action
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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