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Stock Purchase Warrants (Tables) | 9 Months Ended
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Sep. 30, 2018
Stock Purchase Warrants [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The assumptions used by the Company are summarized in the following table:
|  | Series A |
|  | September 31, 2018 |  |  | December 31, 2017 |  |  | Issuance Date |
Closing stock price |  | $ | 2.60 |  |  | $ | 17.85 |  |  | $ | 31.15 |
Expected dividends |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 80 | % |  |  | 80 | % |  |  | 85 | %
Risk free interest rate |  |  | 2.82 | % |  |  | 1.97 | % |  |  | 1.58 | %
Expected life of warrant (years) |  |  | 2.14 |  |  |  | 2.90 |  |  |  | 4.00 |
The assumptions used by the Company are summarized in the following table:
|  | September 30, 2018 |  |  | December 31, 2017 |  |  | Issuance Date |
Closing stock price |  | $ | 2.60 |  |  | $ | 17.85 |  |  | $ | 61.25 |
Expected dividends |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 90 | % |  |  | 80 | % |  |  | 95 | %
Risk free interest rate |  |  | 2.60 | % |  |  | 1.86 | % |  |  | 1.39 | %
Expected life of warrant (years) |  |  | 1.04 |  |  |  | 1.79 |  |  |  | 5.00 |
The assumptions used by the Company are summarized in the following table:
|  | Issuance Date |
Closing stock price |  | $ | 18.55 |
Expected dividends |  |  | 0 | %
Expected volatility |  |  | 85 | %
Risk free interest rate |  |  | 2.42 | %
Expected life of warrant (years) |  |  | 4.92 |
Schedule Of Estimated Fair Value Of The Warrant Liability [Table Text Block] | The following table summarizes the estimated fair value of the warrant liability (in thousands) :
Balance at December 31, 2017 |  | $ | 4,083 |
Change in fair value of warrant liability |  |  | (4,064 | )
Balance at September 30, 2018 |  | $ | 19 |
Schedule Of Warrant Activity [Table Text Block] | A summary of warrant activity for the Company for the nine months ended September 30, 2018 is as follows:
|  | Number of Warrants |  |  | Weighted Average Exercise Price |
Balance at December 31, 2017 |  |  | 915,138 |  |  | $ | 52.50 |
Granted |  |  | 714 |  |  |  | 18.20 |
Exercised |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |
Balance at September 30, 2018 |  |  | 915,852 |  |  | $ | 52.48 |
Schedule Of Warrant Outstanding and Exercisable [Table Text Block] | A summary of all outstanding and exercisable warrants as of September 30, 2018 is as follows:
Exercise Price |  |  | Warrants Outstanding |  |  | Warrants Exercisable |  |  | Weighted Average Remaining Contractual Life (years) |
$ | 18.20 |  |  |  | 714 |  |  |  | 714 |  |  |  | 4.24 |
$ | 50.05 |  |  |  | 714,286 |  |  |  | 714,286 |  |  |  | 2.14 |
$ | 61.25 |  |  |  | 200,852 |  |  |  | 200,852 |  |  |  | 1.03 |
$ | 52.48 |  |  |  | 915,852 |  |  |  | 915,852 |  |  |  | 1.90 |

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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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