Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ 10,261	$ 18,359
PRC [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	10,266	18,460
BVI [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	5	(91)
Others [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ (10)	$ (10)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration