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Stock Options (Details) | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 item | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Maximum | Dec. 31, 2012 Minimum | Dec. 31, 2012 Preferred stock | Dec. 31, 2012 1995 Plan | Dec. 31, 2001 1995 Plan | Dec. 31, 1995 1995 Plan | Dec. 31, 2012 1995 Non-Employee Director Plan | Apr. 30, 2002 1995 Non-Employee Director Plan | Dec. 31, 1995 1995 Non-Employee Director Plan | May 17, 2012 2005 Plan | May 19, 2011 2005 Plan | May 20, 2010 2005 Plan | May 21, 2009 2005 Plan | May 29, 2008 2005 Plan | May 30, 2007 2005 Plan | Dec. 31, 2012 2005 Plan item | Mar. 17, 2005 2005 Plan | Dec. 31, 2012 2005 Plan Non-employee Board member
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock-based compensation plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  |  |  | 825,000 | 400,000 |  | 65,000 | 40,000 | 3,700,000 | 3,400,000 | 3,000,000 | 2,500,000 |  | 1,500,000 |  | 750,000 |
Options exercised (in shares) |  |  |  |  |  |  | 67,365 |  |  |  |  |  |  |  |  |  |  |  | 297,001 |  |
Options outstanding (in shares) | 2,779,000 | 2,691,000 | 2,380,000 |  |  |  | 188,175 |  |  | 17,500 |  |  |  |  |  |  |  |  | 2,573,500 |  |
Options granted (in shares) |  |  |  |  |  |  |  |  |  | 62,500 |  |  |  |  |  |  |  |  | 3,259,500 |  |
Options cancelled (in shares) |  |  |  |  |  |  |  |  |  | 45,000 |  |  |  |  |  |  |  |  | 388,999 |  |
Additional increase in number of shares available for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 400,000 | 500,000 | 500,000 | 500,000 | 750,000 |  |  |
Number of separate equity incentive programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Options that will be granted upon initial election or appointment to the Board (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000
Preceding period within which individual has not previously been employed by the company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months
Options that will be granted to purchase shares of common stock on the date of each annual stockholders meeting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000
Period for which individual should serve as a non-employee Board member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months
Shares available for future grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 829,499 |  |
Common Shares Reserved for Future Issuance | 4,773,000 |  |  |  |  | 1,164,000 | 188,000 |  |  | 18,000 |  |  |  |  |  |  |  |  | 3,403,000 |  |
Option exercisable period one | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option exercisable period two | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option exercisable period three | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price as a percentage of the fair market value of common stock in case of optionees holding more than 10% of voting stock |  |  |  | 110.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting stock percentage to be held by optionees |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration term for incentive stock options granted to holders of more than 10% of the entity's voting stock | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the number of share options of common stock that will be granted under the stock based compensation plan upon initial election or appointment to the Board, provided that individual has not previously been employed by the entity in the preceding six months. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 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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