Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Schedule Of Interest Expenses For Debt Arrangements (Detail)

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Property and Equipment - Schedule Of Interest Expenses For Debt Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment [Line Items]      
Total property and equipment   $ 2,917 $ 2,872
Less: accumulated depreciation   (644) (475)
Property and equipment, net $ 12,278 9,513 2,397
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   1,339 1,306
Property Plant And Equipment Useful Life 5 years    
Furniture And Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   291 284
Property Plant And Equipment Useful Life 5 years    
Leaseholds And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   1,011 1,006
Property, Plant and Equipment, Estimated Useful Lives Lesser of useful life or term    
Capital leases (primarily composed of computer equipment) [Member]      
Property, Plant and Equipment [Line Items]      
Total property and equipment   $ 276 $ 276
Property Plant And Equipment Useful Life 5 years