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COMMITMENTS AND CONTINGENCIES - Future minimum annual payments under operating leases (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating leases, 2019 (remainder) $ 5,784
Operating leases, 2020 6,914
Operating leases, 2021 4,883
Operating leases, 2022 1,985
Operating leases, 2023 1,628
Operating leases, thereafter 429
Operating leases, total $ 21,623