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Fair Value Measurements - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 5,751,000 |  | $ 5,751,000 |  | $ 5,751,000 |  |  | $ 9,685,000 |  |
Change in fair value of convertible note embedded derivative liability |  |  | $ (1,658,000) | $ 2,853,000 | $ (6,310,000) | $ 2,423,000 |  |  |  |
Stock price (in dollars per share) | $ 1.79 | $ 1.51 | $ 1.79 | $ 0.68 | $ 1.79 | $ 0.68 | $ 1.51 | $ 0.94 | $ 1.05 | $ 0.99
Extinguishment of debt | $ 1,368,000 | $ 6,000,000 | $ 1,368,000 |  | $ 7,368,000 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | (2,526,000) | $ 797,000 |  |  |  |
Change in fair value of warrant liability |  |  | $ (898,000) | $ 937,000 | $ (2,526,000) | $ 797,000 |  |  |  |
Convertible note embedded derivative liability |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price (in dollars per share) | $ 1.79 |  | $ 1.79 |  | $ 1.79 |  |  |  |  |
Convertible note embedded derivative liability | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 3,632,000 |  |  |  |  |
Convertible notes |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Original discount |  |  |  |  |  |  |  |  |  | $ 4,916,000
Notes converted | $ 1,368,000 | 6,000,000 |  |  |  |  |  |  |  |
Debt face amount | 8,632,000 |  | $ 8,632,000 |  | 8,632,000 |  |  |  |  | $ 16,000,000
Debt issuance costs and discount | 2,881,000 |  | 2,881,000 |  | 2,881,000 |  |  | $ 6,315,000 |  |
Long-term debt | 5,751,000 |  | $ 5,751,000 |  | $ 5,751,000 |  |  | $ 9,685,000 |  |
Extinguishment of debt | $ 911,000 | $ 3,800,000 |  |  |  |  |  |  |  |

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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