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Commitments and Contingencies - Summary of Liability Related to Lease (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract] |  |
Beginning balance | $ 2,106 | $ 3,033
Net rental payments | (691) | (1,352)
Accretion of discount | 145 | 220
(Decrease) increase in net estimated contract termination costs | (85) | 205
Ending balance | $ 1,475 | $ 2,106

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