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Stockholders' Equity (Narrative) (Details) (USD $)
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6 Months Ended | 12 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Jun. 30, 2012
Issuance of 290,203 5-10 year options [Member]
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Jun. 30, 2012
Issuance of 1,161,736 8-10 year options [Member]
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Jun. 30, 2012
Issuance of 216,959 5-10 year options [Member]
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Jun. 30, 2012
Chief Executive Officer [Member]
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Jun. 30, 2012
Stock Compensation Plan [Member]
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Jun. 30, 2012
Maximum restricted shares granted [Member]
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Jun. 30, 2012
Maximum number of shares in respect to stock options [Member]
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Jun. 30, 2012
Maximum restricted shares granted to one person [Member]
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Jun. 30, 2012
Restricted Stock [Member]
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Dec. 31, 2011
Restricted Stock [Member]
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Jun. 30, 2012
Approximations [Member]
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Jun. 30, 2011
Approximations [Member]
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Jun. 30, 2012
Approximations [Member]
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Jun. 30, 2011
Approximations [Member]
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Jun. 30, 2012
Maximum [Member]
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Jun. 30, 2012
Maximum [Member]
Chief Executive Officer [Member]
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Jun. 30, 2012
Maximum [Member]
Directors, Officers and Employees [Member]
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Jun. 30, 2012
Minimum [Member]
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Jun. 30, 2012
Minimum [Member]
Chief Executive Officer [Member]
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Jun. 30, 2012
Minimum [Member]
Directors, Officers and Employees [Member]
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| Common Stock, Shares Authorized | 500,000,000 | 500,000,000 | ||||||||||||||||||||||
| Common Stock, Shares, Outstanding | 12,503,982 | 12,427,220 | ||||||||||||||||||||||
| Common shares reserved for issuance | 1,555 | |||||||||||||||||||||||
| Number of options outstanding | 1,668,898 | 1,674,065 | 1,772,348 | |||||||||||||||||||||
| Class of Warrant or Right, Outstanding | 1,034,996 | |||||||||||||||||||||||
| Unvested Shares | 62,211 | 120,021 | ||||||||||||||||||||||
| Issued but unvested restricted stock | 33,625 | |||||||||||||||||||||||
| Total stock and stock equivalents outstanding | 15,271,642 | |||||||||||||||||||||||
| Common Stock, Capital Shares Reserved for Future Issuance | 2,500,000 | 1,250,000 | 266,667 | 166,667 | ||||||||||||||||||||
| Number of options vested and expected to vest outstanding | 1,478,768 | 1,345,541 | ||||||||||||||||||||||
| Stock option expense | $ 200,000 | $ 200,000 | $ 400,000 | $ 600,000 | ||||||||||||||||||||
| Non-qualified stock options | 290,203 | 1,136,748 | 241,947 | 665,088 | ||||||||||||||||||||
| Contractural lives | 8 years 8 months 12 days | 8 years 9 months 18 days | 3 years 7 months 6 days | 3 years 4 months 24 days | ||||||||||||||||||||
| Lower Limit | $ 4.5 | $ 5.42 | $ 5.7 | |||||||||||||||||||||
| Upper Limit | $ 14.4 | $ 23.85 | $ 19.2 | |||||||||||||||||||||
| Aggregate intrinsic value | 0 | |||||||||||||||||||||||
| Unrecognized compensation costs | 200,000 | 400,000 | ||||||||||||||||||||||
| Expected compensation cost | 200,000 | 200,000 | ||||||||||||||||||||||
| Weighted average recognition period | 1 year 3 months 29 days | |||||||||||||||||||||||
| Restricted stock grants estimated forfeiture amount | 3.20% | 1.50% | ||||||||||||||||||||||
| Share-based Compensation | $ 628,445 | $ 784,936 | $ 300,000 | $ 300,000 | $ 600,000 | $ 800,000 | ||||||||||||||||||
| Equity Issuance, Per Share Amount | $ 2.02 | $ 2.04 | ||||||||||||||||||||||