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Equipment Lease Obligations - Schedule of Future Minimum Lease Payments for Equipment Lease Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]    
2017 $ 721  
2018 589  
Total minimum lease payments 1,310  
Amount representing interest at 0% - 5% (64)  
Present value of payments 1,246  
Less: current portion (674) $ (409)
Total equipment financing obligations, net of current portion $ 572 $ 1,246