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Debt and Other Financing - Summary of Minimum Required Maturities (Detail) - New Credit Agreement - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument, Redemption [Line Items]    
For the remaining nine months ending December 31, 2018 $ 0  
2019 1,250  
2020 5,000  
2021 15,250  
Total outstanding $ 21,500 $ 21,500