Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Total, at cost	$ 31,217	$ 30,207
Less: Accumulated Depreciation and Amortization, Property, Plant, and Equipment	(13,660)	(12,916)
Property, Plant and Equipment, Net	17,557	17,291
Building
Property, Plant and Equipment
Total, at cost	6,000	5,695
Land
Property, Plant and Equipment
Total, at cost	2,114	2,114
Office Equipment
Property, Plant and Equipment
Total, at cost	3,801	3,413
Computer Equipment
Property, Plant and Equipment
Total, at cost	19,283	18,985
Leasehold Improvements
Property, Plant and Equipment
Total, at cost	$ 19	$ 0