v3.5.0.2
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property Plant And Equipment [Abstract]        
Depreciation expense $ 22 $ 25 $ 65 $ 73