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Stock-Based Compensation Arrangements (Details 3) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 185 Months Ended | 194 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 | Sep. 30, 2012 | May 23, 2012 | May 14, 2008
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  |  |  |  |  |  | 10,000,000 | 5,200,000
Number of shares reserved for issuance before amendment |  |  |  |  |  |  |  |  |  | 5,200,000 | 3,000,000
Compensation cost | $ 76,000 | $ 221,000 | $ 287,000 | $ 677,000 | $ 882,000 | $ 1,746,000 | $ 810,000 |  |  |  |
Cash proceeds |  |  | 48,000 | 3,000 | 3,000 |  | 7,000 | 173,000 | 221,000 |  |
Number of options outstanding |  |  |  |  |  |  |  |  |  |  |
Exercised (in shares) |  |  |  |  | (948) | (24,902) |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value (in dollars per share) |  |  | $ 2.52 | $ 8.05 | $ 8.05 | $ 9.80 | $ 2.73 |  |  |  |
Total remaining unrecognized compensation cost |  |  |  |  | 500,000 |  |  | 500,000 |  |  |
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost |  |  |  |  | 2 years 10 months 17 days |  |  |  |  |  |
Cash proceeds |  |  | 48,000 | 3,000 | 3,000 | 100,000 | 7,000 |  |  |  |
Total intrinsic value of options exercised |  |  |  |  | 1,000 | 200,000 | 11,000 |  |  |  |
Number of options outstanding |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  | 502,249 | 498,562 | 498,562 | 478,554 |  |  |  |  |
Granted (in shares) |  |  | 33,571 | 28,500 | 28,500 | 86,758 |  |  |  |  |
Exercised (in shares) |  |  | (15,438) | (948) | (948) | (24,901) | (2,454) |  |  |  |
Cancelled / forfeited (in shares) |  |  | (39,970) |  | (23,865) | (41,849) |  |  |  |  |
Options outstanding at the end of the period (in shares) | 480,415 |  | 480,415 |  | 502,249 | 498,562 | 478,554 | 502,249 | 480,415 |  |
Unvested at the end of the period (in shares) | 77,607 |  | 77,607 |  | 90,237 |  |  | 90,237 | 77,607 |  |
Vested and exercisable at the end of the period (in shares) | 402,808 |  | 402,808 |  | 412,012 |  |  | 412,012 | 402,808 |  |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  |  | $ 26.11 | $ 27.72 | $ 27.72 | $ 29.47 |  |  |  |  |
Granted (in dollars per share) |  |  | $ 3.29 |  | $ 10.64 | $ 12.74 |  |  |  |  |
Exercised (in dollars per share) |  |  | $ 3.06 |  | $ 2.87 | $ 3.01 |  |  |  |  |
Cancelled / forfeited (in dollars per share) |  |  | $ 20.03 |  | $ 40.53 | $ 31.78 |  |  |  |  |
Options outstanding at the end of the period (in dollars per share) | $ 25.76 |  | $ 25.76 |  | $ 26.11 | $ 27.72 | $ 29.47 | $ 26.11 | $ 25.76 |  |
Unvested at the end of the period (in dollars per share) | $ 9.00 |  | $ 9.00 |  | $ 12.11 |  |  | $ 12.11 | $ 9.00 |  |
Vested and exercisable at the end of the period (in dollars per share) | $ 28.99 |  | $ 28.99 |  | $ 29.19 |  |  | $ 29.19 | $ 28.99 |  |
Weighted average remaining contractual term |  |  |  |  |  |  |  |  |  |  |
Options outstanding |  |  | 5 years 10 months 2 days |  | 6 years 5 months 8 days | 7 years 2 months 19 days | 7 years 9 months 4 days |  |  |  |
Unvested at the end of the period |  |  | 8 years 8 months 1 day |  | 8 years 9 months |  |  |  |  |  |
Vested and exercisable at the end of the period |  |  | 5 years 3 months 18 days |  | 5 years 11 months 5 days |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |  |
Options outstanding | 212,000 |  | 212,000 |  | 140,000 | 938,000 | 698,000 | 140,000 | 212,000 |  |
Unvested at the end of the period | 36,000 |  | 36,000 |  | 3,000 |  |  | 3,000 | 36,000 |  |
Vested and exercisable at the end of the period | 176,000 |  | 176,000 |  | 136,000 |  |  | 136,000 | 176,000 |  |
Stock options | Employees and directors |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |
Grant date fair value |  |  |  |  | 200,000 | 600,000 | 100,000 |  |  |  |
Compensation cost |  |  |  |  | $ 24,000 | $ 50,000 | $ 28,000 |  |  |  |
Weighted average grant-date fair value (in dollars per share) |  |  |  |  | $ 8.05 | $ 9.80 | $ 2.73 |  |  |  |
Number of options outstanding |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 28,500 | 100,000 | 32,000 |  |  |  |

X
- Definition The maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments prior to amendment during the period, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References No definition available. + Details
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- Definition Weighted average remaining contractual term for unvested options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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