Stock Based Compensation (Employee Stock Purchase Plan) (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 01, 2009 | Aug. 31, 2009 | |
| Stock Based Compensation [Abstract] | ||||||
| ESPP allowed purchase price, percentage of the fair value per share | 90.00% | 95.00% | ||||
| Maximum percentage of base salary allowed to purchase shares | 15.00% | 15.00% | ||||
| Maximum allowed amount per year to purchase shares | $ 25,000 | |||||
| Shares reserved for issuance over the term of the ESPP | 4,200,000 | 4,200,000 | ||||
| Common shares issued under the ESPP | 35,742 | 32,389 | ||||
| Allocated share-based compensation expense | $ 24,000 | $ 17,000 | $ 64,000 | $ 51,000 | ||
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from employee stock purchase plan arrangements with employees, directors and certain consultants qualifying for treatment as employees.
|
| X | ||||||||||
- Definition Common stock reserved for issuance under employee stock purchase plan.
|
| X | ||||||||||
- Definition Represents the discounted fair value (in percentage) at which shares will be issued to eligible employees under the Employee Stock Purchase Plan.
|
| X | ||||||||||
- Definition Represents the maximum allowed amount per calendar year for purchase of shares by eligible employees under Employee Share Purchase Plan.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|