Geographic Information - Fixed Assets and Total Assets by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, net	$ 714	$ 1,158
Total Assets	10,814	24,830
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, net	710	1,082
Total Assets	9,099	15,126
Total international
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, net	4	76
Total Assets	1,715	9,704
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, net	0	71
Total Assets	0	8,352
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and Equipment, net	4	5
Total Assets	$ 1,715	$ 1,352