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Stock-Based Compensation (Narrative) (Details) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2013
item
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Jun. 30, 2013
item
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Jun. 30, 2012
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Jun. 30, 2013
item
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Jun. 30, 2012
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Apr. 30, 2013
Unvested Restricted Stock [Member]
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Mar. 31, 2013
Unvested Restricted Stock [Member]
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Feb. 28, 2013
Unvested Restricted Stock [Member]
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Jun. 30, 2013
Unvested Restricted Stock [Member]
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Jun. 30, 2013
The 1996 Plan [Member]
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Jun. 30, 2013
The 2002 Plan [Member]
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Jun. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
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Jun. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
Minimum [Member]
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Jun. 30, 2013
The 1996 Plan and the 2002 Plan [Member]
Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||
| Number of stock based compensation plans in which instruments are outstanding | 2 | 2 | 2 | |||||||||||
| Total number of shares authorized | 1,500,000 | 12,000,000 | ||||||||||||
| Stock based compensation, granted stock options' vesting period | 1 year | 4 years | ||||||||||||
| Stock based compensation, outstanding stock options' expiration period | 10 years | |||||||||||||
| Stock based compensation, outstanding stock options' expiration period upon optionee's separation from employment | 90 days | |||||||||||||
| Stock compensation expense | $ 679,000 | $ 716,000 | $ 1,422,125 | $ 1,133,866 | ||||||||||
| Shares of restricted stock vested | 85,000 | 560,000 | 100,000 | 745,000 | ||||||||||
| Aggregate fair value of restricted stock vested | 224,000 | 1,800,000 | 308,000 | |||||||||||
| Unrecognized compensation cost related to unvested stock-based awards | $ 3,300,000 | $ 3,300,000 | $ 3,300,000 | |||||||||||
| Unrecognized compensation cost related to unvested stock-based awards, weighted average recognition period | 2 years | |||||||||||||
| Stock options canceled | 50,000 | |||||||||||||