XML 68 R51.htm IDEA: XBRL DOCUMENT v3.10.0.1
Composition of Certain Financial Statement Captions (Other Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Assets [Abstract]      
Amortization expense for certain other assets $ 231 $ 218 $ 345