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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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