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COMMITMENTS AND CONTINGENCIES - Summary of Maturities of Operating Lease Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Nine months ending December 31, 2020	$ 4,298
2021	6,385
2022	6,463
2023	6,551
2024	6,689
Thereafter	26,134
Total lease payments	56,520
Imputed interest	(13,023)
Total	43,497
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Condensed Consolidated Balance Sheet)	3,299
Operating lease liabilities - long-term	40,198	$ 41,192
Total	$ 43,497

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