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Internally Developed Capitalized Software - Amortization Expense for Future Periods (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
For the remaining nine months ending December 31, 2017 $ 105  
2018 58  
Net Carrying Amount 163 $ 210
Depreciation Expense Related to Capitalized Software    
Property, Plant and Equipment [Line Items]    
For the remaining nine months ending December 31, 2017 2,569  
2018 2,643  
2019 1,649  
2020 20  
Net Carrying Amount $ 6,881