XML 54 R43.htm IDEA: XBRL DOCUMENT v3.10.0.1
Revenue From Contracts With Customers - Schedule of Deferred Revenue by Arrangement (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Deferred Revenue [Abstract]      
Deferred revenue, current $ 10,729 $ 11,322 $ 12,842
Long-term deferred revenue $ 3,551 $ 3,126