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Stockholders' Equity and Stock Based Compensation (Details)
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12 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
1995 Plan
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May 07, 1998
1995 Plan
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Dec. 31, 2013
1995 Director Plan
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May 07, 1998
1995 Director Plan
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Dec. 31, 2013
1995 Director Plan
Vesting of awards in equal quarterly installments from expiration of one year from the date of grant
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Dec. 31, 2013
1995 Director Plan
Vesting of awards in one year from the date of grant
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Mar. 01, 2002
1995 Plan and 1995 Director Plan
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Dec. 31, 2013
2006 Plan
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Jun. 14, 2006
2006 Plan
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Aug. 31, 2006
2006 Plan
Restricted stock
installment
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Dec. 31, 2013
2006 Plan
Restricted stock
installment
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Dec. 31, 2012
2006 Plan
Restricted stock
installment
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Dec. 31, 2011
2006 Plan
Restricted stock
installment
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Dec. 31, 2010
2006 Plan
Restricted stock
installment
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Dec. 31, 2009
2006 Plan
Restricted stock
installment
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Dec. 31, 2008
2006 Plan
Restricted stock
installment
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Dec. 31, 2007
2006 Plan
Restricted stock
installment
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Aug. 31, 2006
2006 Plan
Restricted stock
CEO
installment
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Dec. 31, 2013
2012 Plan
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Jun. 06, 2012
2012 Plan
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Dec. 31, 2013
2006 Plan and 2012 Plan
Restricted stock
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Dec. 31, 2012
2006 Plan and 2012 Plan
Restricted stock
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Dec. 31, 2011
2006 Plan and 2012 Plan
Restricted stock
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Dec. 31, 2013
2006 Plan and 2012 Plan
Restricted stock
CEO
installment
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| Stock-based compensation | ||||||||||||||||||||||||
| Number of shares of common stock initially available for award | 1,137,500 | 187,500 | 800,000 | 600,000 | ||||||||||||||||||||
| Expiration period | 10 years | 10 years | ||||||||||||||||||||||
| Vesting period | 5 years | |||||||||||||||||||||||
| Percentage of award vesting | 5.00% | 20.00% | ||||||||||||||||||||||
| Period from grant date after which awards begin to vest | 1 year | |||||||||||||||||||||||
| Options surrendered (in shares) | 303,550 | |||||||||||||||||||||||
| Options reserved for future issuance (in shares) | 0 | 578,050 | ||||||||||||||||||||||
| Granted (in shares) | 315,000 | 56,500 | 92,000 | 15,000 | 150,500 | 140,000 | 57,500 | 30,000 | 200,000 | 56,500 | 92,000 | 15,000 | 40,000 | |||||||||||
| Number of equal quarterly installments for vesting of awards | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 40 | 16 | ||||||||||||||
| Forfeited (in shares) | 775 | 3,525 | 8,375 | 5,875 | 3,500 | 12,500 | 775 | 3,525 | 8,375 | |||||||||||||||