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Notes Payable - Additional Information (Detail) (USD $)
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6 Months Ended | ||
|---|---|---|---|
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Jun. 30, 2013
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Oct. 05, 2012
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Aug. 14, 2012
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| Short-term Debt [Line Items] | |||
| Royalty contractual term | 8 years | ||
| Long term debt paid | $ 19,050,000 | $ 1,750,000 | |
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Revenue Interest Purchase Agreement
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| Short-term Debt [Line Items] | |||
| Royalty percentage on net revenue | 9.95% | ||
| Total debt | 20,800,000 | 20,800,000 | |
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Revenue Interest Purchase Agreement | Minimum
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| Short-term Debt [Line Items] | |||
| Varying amount | 1,300,000 | ||
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Revenue Interest Purchase Agreement | Maximum
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| Short-term Debt [Line Items] | |||
| Varying amount | $ 2,500,000 | ||
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Put Option
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| Short-term Debt [Line Items] | |||
| Internal rate of return on funded amount | 20.00% | ||
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Call Option [Member]
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| Short-term Debt [Line Items] | |||
| Internal rate of return on funded amount | 32.50% |