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Accounting for Stock- Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2012
Accounting for stock-based compensation [Abstract] |
Summarized details of stock-based compensation expense recognized in the accompanying condensed consolidated statements of operations |
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Stock-based compensation |  | $ | 3,820 |  |  | $ | 3,321 |  |  | $ | 9,770 |  |  | $ | 8,023 |
Assumptions used to calculate fair of employee stock options |
|  | Performance-based |  | Time-based
Risk-free interest rate |  | 0.20% — 0.29% |  | 0.83%
Expected lives |  | 0.96 — 1.87 years |  | 6.08 years
Volatility |  | 62.35% — 70.56% |  | 81.81%
Dividends |  | — |  | —

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + 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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