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Equipment Lease Obligations - Schedule of Future Minimum Lease Payments for Equipment Lease Obligations (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Leases [Abstract]    
2018 $ 664  
2019 10  
Total minimum lease payments 674  
Amount representing interest at 0% - 4.95% (25)  
Present value of payments 649  
Less: current portion (641) $ (674)
Total equipment financing obligations, net of current portion $ 8 $ 572