Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ 370	$ 1,344
PRC [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	389	1,349
BVI [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	(2)	3
Others [Member]
Summary of Pre-tax income in jurisdictions
Pre-tax income	$ (5)	$ (2)

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://fasb.org/us-gaap/role/ref/legacyRef
-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

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