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Long Term Debt - Interest Expense Included in Consolidated Income Statement (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest Expense, Debt [Abstract]        
Cash interest expense       $ 162
Non-cash amortization of debt discount       254
Amortization of debt costs       13
Amortization of settlement obligations $ 23 $ 47 $ 46 92
Interest expense capital lease 21 60 51 130
Capital lease - fair value amortization (23) (37) (53) (74)
Total interest expense $ 21 $ 70 $ 44 $ 577