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Notes Payable - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument    
Total notes payable $ 41,912 $ 41,704
Less: current portion of notes payable (41,303) (40,696)
Notes payable, net of current portion 609 1,008
Medium-term Notes [Member] | Term Loan Agreement [Member]    
Debt Instrument    
Total notes payable 39,782 39,228
Line of Credit [Member] | Equipment Lease Credit Facility [Member]    
Debt Instrument    
Total notes payable $ 2,130 $ 2,476