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Commitments and Contingencies - Summary of Liability Related to Lease (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |  |
Beginning balance | $ 3,033 | $ 1,787
Net rental payments | (1,352) | (403)
Accretion of discount | 220 | 178
Increase in net estimated contract termination costs | 205 | 1,471
Ending balance | $ 2,106 | $ 3,033

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