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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary Of Significant Accounting Policies Share-based Compensation Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The following table summarizes the weighted-average valuation assumptions and weighted-average grant date fair value of options granted during the periods shown below:
|  |  | Year Ended December 31,
|  |  | 2016 |  |  | 2015 |  |  | 2014
Assumptions (weighted-average) |  |  |  |  |  |  |  |  |
Volatility |  |  | 84% |  |  | 98% |  |  | 100%
Expected term (in years) |  |  | 4.0 |  |  | 4.0 |  |  | 4.0
Risk-free rate |  |  | 1.2% |  |  | 1.3% |  |  | 1.3%
Expected dividends |  |  | 0.0% |  |  | 0.0% |  |  | 0.0%
Pre-vest forfeiture rate |  |  | 8.5% |  |  | 8.5% |  |  | 8.5%
Grant date fair value of options granted |  | $ | 1.12 |  | $ | 2.20 |  | $ | 1.22
Options activity and positions | The following table summarizes activity and positions with respect to options for the periods shown below (in thousands):
|  |  |  |  |  |  |  |  | Weighted-average |  |  |
|  |  |  |  |  |  |  |  | remaining |  |  | Aggregate
|  |  |  |  |  | Weighted-average |  |  | contractual |  |  | intrinsic
Options |  |  | Shares |  |  | exercise price |  |  | term (in years) |  |  | value
Outstanding as of January 1, 2014 |  |  | 1,905 |  | $ | 8.86 |  |  | 7.4 |  | $ | 1,500
Granted |  |  | 717 |  |  | 1.78 |  |  | - |  |  | -
Exercised |  |  | - |  |  | - |  |  | - |  |  | -
Forfeited or expired |  |  | (195) |  |  | 9.49 |  |  | - |  |  | -
Outstanding as of December 31, 2014 |  |  | 2,427 |  |  | 6.72 |  |  | 7.4 |  |  | 18,700
Granted |  |  | 849 |  |  | 3.23 |  |  | - |  |  | -
Exercised |  |  | (23) |  |  | 1.88 |  |  | - |  |  | -
Forfeited or expired |  |  | (107) |  |  | 13.98 |  |  | - |  |  | -
Outstanding as of December 31, 2015 |  |  | 3,146 |  |  | 5.56 |  |  | 7.3 |  |  | 1,613
Granted |  |  | 1,167 |  |  | 1.83 |  |  | - |  |  | -
Exercised |  |  | (3) |  |  | 1.77 |  |  | - |  |  | -
Forfeited or expired |  |  | (307) |  |  | 12.58 |  |  | - |  |  | -
Outstanding as of December 31, 2016 |  |  | 4,003 |  | $ | 3.94 |  |  | 7.3 |  | $ | 4
Vested and expected to vest as of December 31, 2016 |  |  | 3,747 |  | $ | 4.06 |  |  | 7.2 |  | $ | 3
Exercisable as of December 31, 2016 |  |  | 2,032 |  | $ | 5.61 |  |  | 5.8 |  | $ | -

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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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