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Debt Agreements (Tables) | 6 Months Ended
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Jun. 30, 2018
Horizon Warrants [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The key assumptions used to value the Horizon Warrants were as follows:
Assumption
Date of issuance |  |  | July 27, 2017 |
Expected price volatility |  |  | 47 | %
Expected term (in years) |  |  | 7.00 |
Risk-free interest rate |  |  | 2.12 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 1.02 |
New Horizon Warrants [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The key assumptions used to value the new Horizon warrants were as follows:
Assumption
Date of issuance |  |  | March 21, 2018 |
Expected price volatility |  |  | 86 | %
Expected term (in years) |  |  | 7.00 |
Risk-free interest rate |  |  | 2.82 | %
Dividend yield |  |  | 0.00 | %
Weighted-average fair value of warrants |  | $ | 0.81 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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