Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 700 $ 689
Less accumulated depreciation and amortization (555) (535)
Total 145 154
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 334 334
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 219 208
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 147 $ 147