Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ 1,136	$ 3,790	$ 5,349	$ 11,908
PRC [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	1,135	3,793	5,353	12,006
BVI [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	4		4	(91)
Others [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ (3)	$ (3)	$ (8)	$ (7)