XML 120 R83.htm IDEA: XBRL DOCUMENT v3.10.0.1
Operating Segment and Enterprise Wide Reporting - Schedule of Net Long-lived Tangible Assets by Location (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets $ 22,005 $ 25,249
United States [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets 20,880 23,943
United Kingdom [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets 522 727
Europe (Excluding United Kingdom) [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets 83 163
Asia Pacific [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets 517 413
Other [Member]    
Revenues From External Customers And Long Lived Assets [Line Items]    
Net long-lived tangible assets $ 3 $ 3