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Accretion of Debt Issuance Cost and Debt Discount (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt Disclosure [Abstract]        
Amortization of debt discount $ 69 $ 385 $ 141 $ 698
Accretion expense - debt issuance cost $ 21 $ 10 $ 35 $ 17