Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Schedule of Property and Equipment (Detail)

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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 634 $ 629
Less accumulated depreciation and amortization (504) (450)
Total 130 179
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 334 334
Computer equipment and office equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 153 143
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 147 $ 152