Marketable Securities - Additional Information (Detail) |
6 Months Ended | 12 Months Ended |
|---|---|---|
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Jun. 30, 2015
USD ($)
Debt_Security
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Dec. 31, 2014
USD ($)
Debt_Security
|
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| Marketable Securities [Abstract] | ||
| Realized gains or losses on marketable securities | $ 0 | |
| Maturity period classified current investments | Less than one year | |
| Maturity period classified non-current investments | Greater than one year and management does not intend to liquidate within the next twelve months. | |
| Number of debt securities held | Debt_Security | 22 | 3 |
| Aggregate fair value of debt securities | $ 10,663,132 | $ 1,222,291 |
| X | ||||||||||
- Definition Maturity period for marketable securities investments classification as current investments. No definition available.
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- Definition Maturity period for marketable securities investments classification as non-current investments. No definition available.
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- Definition Number of held to maturity debt securities. No definition available.
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- Definition This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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