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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2012
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,
|  |  | 2012 |  |  | 2011
Assumptions (weighted average) |  |  |  |  |  |
Volatility |  |  | 98% |  |  | 85%
Expected term (in years) |  |  | 4.5 |  |  | 4.0
Risk-free rate |  |  | 0.6% |  |  | 1.3%
Expected dividends |  |  | 0.0% |  |  | 0.0%
Pre-vest forfeiture rate |  |  | 8.5% |  |  | 7.5%
Grant date fair value of options granted |  | $ | 1.39 |  | $ | 6.10
Options activity and positions | Options Activity and Positions The following table summarizes activity and positions with respect to options for the two years ended December 31, 2012:
|  |  |  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  |  |  |  |  | Average |  |  |
|  |  |  |  |  | Weighted |  |  | Remaining |  |  |
|  |  |  |  |  | Average |  |  | Contractual |  |  | Aggregate
|  |  |  |  |  | Exercise |  |  | Term |  |  | Intrinsic
Options |  |  | Shares |  |  | Price |  |  | (years) |  |  | Value
Outstanding as of December 31, 2010 |  |  | 1,092,000 |  | $ | 27.20 |  |  | 5.9 |  | $ | 96,309
Granted |  |  | 121,000 |  |  | 10.00 |  |  |  |  |  |
Exercised |  |  | (5,000) |  |  | 15.12 |  |  |  |  |  |
Forfeited or expired |  |  | (244,000) |  |  | 31.60 |  |  |  |  |  |
Outstanding as of December 31, 2011 |  |  | 964,000 |  |  | 24.00 |  |  | 5.8 |  |  | -
Granted |  |  | 671,000 |  |  | 1.97 |  |  |  |  |  |
Exercised |  |  | (16,000) |  |  | 1.80 |  |  |  |  |  |
Forfeited or expired |  |  | (301,000) |  |  | 21.20 |  |  |  |  |  |
Outstanding as of December 31, 2012 |  |  | 1,318,000 |  | $ | 13.71 |  |  | 6.8 |  | $ | 61,871
Vested and expected to vest as of December 31, 2012 |  |  | 1,285,000 |  | $ | 13.97 |  |  | 6.7 |  | $ | 59,481
Exercisable as of December 31, 2012 |  |  | 777,000 |  | $ | 20.34 |  |  | 5.4 |  | $ | 20,444

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- Definition Tabular disclosure of 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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -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 -Topic 718 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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