Quarterly report pursuant to Section 13 or 15(d)

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

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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment $ 22,633 $ 22,120
Less accumulated depreciation 17,732 17,285
Property and equipment, net of accumulated depreciation 4,901 4,835
Less impairment charge on classification of property and equipment as assets held for sale 1,350 0
Property and equipment, net of accumulated depreciation and impairment charge 3,551 4,835
Property and equipment, net of accumulated depreciation (3,551) (4,835)
Property and equipment, net of accumulated depreciation 0 0
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 9,046 8,552
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 375 375
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 13,212 $ 13,193