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Notes Payable - Schedule of Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Term Loan Agreement [Member] | Medium-term Notes [Member]    
Debt Instrument    
Deferred issuance costs $ 2,500 $ 3,000
Equipment Lease Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument    
Deferred issuance costs $ 29 $ 45