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Property and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 900 $ 1,700 $ 1,800
Depreciation 200    
Property and equipment 735 2,040  
Proceeds from sale of property and equipment 52 942 26
Restructuring charges 2,045 10,372 $ 3,503
Facility Closures      
Property, Plant and Equipment [Line Items]      
Restructuring charges   800  
Disposed of by Sale      
Property, Plant and Equipment [Line Items]      
Impairment charges $ 500    
Proceeds from sale of impaired assets   600  
Property and equipment   100  
Proceeds from sale of property and equipment   300  
Gain on disposition of assets   200  
Disposed of by Sale | General and Administrative Expense      
Property, Plant and Equipment [Line Items]      
Impairment charges   $ 300