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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Property and Equipment Useful Life (Detail)
12 Months Ended
Dec. 31, 2018
Furniture and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Laboratory equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 5 years
Leasehold Improvements [Member]  
Property, Plant and Equipment [Line Items]  
Estimated useful life Remaining life of the lease