XML 54 R44.htm IDEA: XBRL DOCUMENT v3.10.0.1
Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Amortization expense related to intangible assets $ 0.1 $ 0.1 $ 0.2 $ 0.2