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Commitment And Contingencies - Additional Information (Detail) (USD $)
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1 Months Ended | |||
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Sep. 18, 2013
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Sep. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Loss Contingencies [Line Items] | ||||
| Annual Rent expense | $ 100,000 | |||
| Monthly lease | 5,000 | |||
| Lease Expiry Date | Jun. 30, 2015 | |||
| Lease termination, advance notice period | 90 days | |||
| Litigation accrual | $ 0 | $ 0 | $ 0 |