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Fair Value of Financial Instruments - Fair Value of Financial Instruments by Balance Sheet Class (Details) (Recurring Basis, USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Total assets at fair value: | $ 190,846,333 | $ 85,801,024 |
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Quoted Prices in Active Markets for Identical Assets (Level 1)
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Total assets at fair value: | 190,846,333 | 85,801,024 |
| Money Market Funds | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Total assets at fair value: | 190,846,333 | 85,801,024 |
| Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Total assets at fair value: | $ 190,846,333 | $ 85,801,024 |