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
 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Total property and equipment   $ 2,922   $ 2,872
Less: accumulated depreciation   (803)   (475)
Property and equipment, net $ 14,163 2,119 $ 9,513 2,397
Equipment [Member]        
Property, Plant and Equipment [Line Items]        
Total property and equipment   1,344   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