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Fair Value Measurements - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Closing stock price | $ 0.21 | $ 0.13
Long-term debt at fair value | $ 8.0 | $ 8.9

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- Definition Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates. + References No definition available. + Details
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