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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial assets subject to fair value measurements (Details) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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Fair Value
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| Cash and cash equivalents | $ 21,983,000 | $ 20,660,842 |
| Corporate bond | 547,000 | 556,376 |
| Total | 22,530,000 | 21,217,218 |
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Fair Value Measurements, Level 1
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| Cash and cash equivalents | 21,983,000 | 20,660,842 |
| Corporate bond | ||
| Total | 21,983,000 | 20,660,842 |
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Fair Value Measurements, Level 2
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| Cash and cash equivalents | ||
| Corporate bond | 547,000 | 556,376 |
| Total | 547,000 | 556,376 |
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Fair Value Measurements, Level 3
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| Cash and cash equivalents | ||
| Total |