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Commitments and Contingencies - Summary of Liability Related to Lease (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract] |  |
Balance as of January 1, | $ 1,103 | $ 452
Net rental receipts (payments) | (558) | (115)
Accretion of discount | 98 | 39
Increase in net estimated contract termination costs | 1,144 | 727
Balance as of December 31, | $ 1,787 | $ 1,103

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