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Stock-Based Compensation (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | |||||||
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Jun. 30, 2014
plan
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Jun. 30, 2013
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Jun. 30, 2014
plan
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Jun. 30, 2013
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Mar. 31, 2014
Unvested Restricted Stock
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Feb. 28, 2014
Unvested Restricted Stock
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Jun. 30, 2014
Unvested Restricted Stock
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Jun. 30, 2014
Stock Incentive 1996 Plan
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Jun. 30, 2014
The 2002 Plan
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Jun. 30, 2014
The 1996 Plan and the 2002 Plan
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Jun. 30, 2014
The 1996 Plan and the 2002 Plan
Minimum
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Jun. 30, 2014
The 1996 Plan and the 2002 Plan
Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||
| Number of stock based compensation plans | 2 | 2 | ||||||||||
| Total number of shares authorized | 1,500,000.0 | 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 | $ 866,732 | $ 679,265 | $ 1,559,935 | $ 1,422,125 | ||||||||
| Shares of restricted stock vested | 100,000 | 49,000 | 149,000 | |||||||||
| Aggregate fair value of restricted stock vested | 205,000 | 96,000 | ||||||||||
| Instruments Other than Options, Forfeited in Period | 175,000 | |||||||||||
| Unrecognized compensation cost related to unvested stock-based awards | $ 2,100,000 | $ 2,100,000 | ||||||||||
| Weighted average recognition period | 2 years 0 months 23 days | |||||||||||