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
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment [Line Items]        
Total property and equipment $ 3,494     $ 2,872
Less: accumulated depreciation (962)     (475)
Property and equipment, net 2,532 $ 14,642 $ 9,513 2,397
Equipment [Member]        
Property, Plant and Equipment [Line Items]        
Total property and equipment $ 1,854     1,306
Property, Plant and Equipment, Useful Life 5 years      
Furniture and Fixtures [Member]        
Property, Plant and Equipment [Line Items]        
Total property and equipment $ 323     284
Property, Plant and Equipment, Useful Life 5 years      
Leasehold Improvements [Member]        
Property, Plant and Equipment [Line Items]        
Total property and equipment $ 1,041     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