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Warrant Liability (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($)
Warrants Liability [Abstract] |  |  |  |
Proceeds from warrant exercise |  |  | $ 0 | $ 24
Initial price of common stock offered (in dollars per share) | $ / shares | $ 15.00 |  | $ 15.00 |
Warrant Liability [Roll Forward] |  |  |  |
Balance as of beginning of period |  |  | $ 7,673 |
Change in fair value recognized | $ 4,116 | $ 0 | 5,278 | $ 309
Exercise of warrants |  |  | (12,951) |
Balance as of end of period | $ 0 |  | $ 0 |
Discount Rate [Member] |  |  |  |
Warrants Liability [Abstract] |  |  |  |
Measurement input of warrants |  | 0.245 |  | 0.245
Volatility Rates [Member] |  |  |  |
Warrants Liability [Abstract] |  |  |  |
Measurement input of warrants |  | 0.9 |  | 0.9
Perceptive Credit Opportunities Fund, LP [Member] |  |  |  |
Warrants Liability [Abstract] |  |  |  |
Number of shares received upon automatic exercise of warrant (in shares) | shares | 863,400 |  | 863,400 |
Proceeds from warrant exercise |  |  | $ 116 |
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member] |  |  |  |
Warrants Liability [Abstract] |  |  |  |
Warrant to purchase senior common equity interest ratio to fully diluted common units | 4.50% |  | 4.50% |
Purchase price of warrant within first year of the loan | $ 3,000 |  | $ 3,000 |
Purchase price of warrant after first year | 5,000 |  | 5,000 |
Warrant liability, fair value | $ 5,800 |  | $ 5,800 |

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- Definition Purchase price of the warrant if exercised under certain circumstances in the first year of the loan. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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