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Stock Option and Purchase Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Stock Option and Purchase Plans [Abstract] |
Estimate fair value of options granted | The following weighted average assumptions were used to estimate the fair value of options granted using the Black-Scholes option-pricing model:
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |
Expected life (years) |  |  | 4.0 |  |  |  | 4.0 |
Expected volatility |  |  | 100.3 | % |  |  | 91.3 | %
Risk-free interest rates |  |  | 1.01 | % |  |  | 2.24 | %
Expected dividend yield |  |  | 1.62 |  |  |  | 0 |
Summary of restricted stock activity | A summary of the restricted stock activity is as follows:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested shares at January 1, 2012 |  |  | 1,145,753 |  |  | $ | 3.05 |
Granted |  |  | 305,000 |  |  |  | 4.05 |
Vested |  |  | (364,193 | ) |  |  | 1.66 |
Forfeited |  |  | (20,000 | ) |  |  | 3.29 |
Nonvested shares at December 31, 2012 |  |  | 1,066,560 |  |  | $ | 3.81 |
Summary of option activity | The following table summarizes option activity for the year ended December 31, 2012:
|  | Number of Shares |  |  | Weighted- average Exercise Price Per Share |  |  | Weighted- average Remaining Term |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2012 |  |  | 1,184,933 |  |  | $ | 4.10 |  |  |  |  |  |  |  |  |
Granted |  |  | 320,500 |  |  |  | 4.06 |  |  |  |  |  |  |  |  |
Exercised |  |  | (110,100 | ) |  |  | 1.12 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (35,700 | ) |  |  | 4.21 |  |  |  |  |  |  |  |  |
Expired |  |  | (306,522 | ) |  |  | 7.31 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 1,053,111 |  |  | $ | 3.46 |  |  |  | 2.71 |  |  | $ | 972,000 |
Exercisable at December 31, 2012 |  |  | 337,322 |  |  | $ | 2.92 |  |  |  | 1.36 |  |  | $ | 724,000 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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