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Changes in Fair Value of Financial Instruments (Detail) (USD $)
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3 Months Ended | 9 Months Ended |
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Sep. 30, 2014
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Sep. 30, 2014
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Purchases | $ 50,000 | |
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Short-term Investments [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance | 243,000 | 0 |
| Purchases | 50,000 | 293,000 |
| Change in fair value of investment | (293,000) | (293,000) |
| Balance | 0 | 0 |
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Long-term Investments [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance | 250,000 | 0 |
| Purchases | 0 | 250,000 |
| Change in fair value of investment | 0 | 0 |
| Balance | $ 250,000 | $ 250,000 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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