XML 77 R60.htm IDEA: XBRL DOCUMENT v3.19.1
REVENUE RECOGNITION AND CONTRACT WITH CUSTOMERS - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Accumulated deficit $ (344,185) $ (332,058)