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Nature of Operations (Details Textuals) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Dec. 31, 2010
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Sep. 30, 2012
Silicon Valley Bank
Credit facility
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Mar. 30, 2012
Silicon Valley Bank
Credit facility
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|---|---|---|---|---|---|---|
| Line of Credit Facility [Line Items] | ||||||
| Working Capital | $ 15,600,000 | |||||
| Cash and cash equivalents | 9,461,404 | 13,856,893 | 22,802,185 | 10,955,403 | ||
| Increase in credit facility | 15,000,000 | |||||
| Availability under credit facility | $ 1,900,000 |