Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary of property and equipment
Property and equipment, gross	$ 43,997	$ 41,173
Less: accumulated depreciation	(22,091)	(21,070)
Property and equipment, net	21,906	20,103
Property and plant [Member]
Summary of property and equipment
Property and equipment, gross	18,343	17,326
Leasehold improvements [Member]
Summary of property and equipment
Property and equipment, gross	17,232	14,473
Construction-in-progress [Member]
Summary of property and equipment
Property and equipment, gross	1,283	2,198
Equipment and machinery [Member]
Summary of property and equipment
Property and equipment, gross	2,882	3,383
Office equipment and furniture [Member]
Summary of property and equipment
Property and equipment, gross	3,105	2,602
Motor vehicles [Member]
Summary of property and equipment
Property and equipment, gross	$ 1,152	$ 1,191