Bank Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of short term bank loans
Bank loans	$ 29,497	$ 37,730
China Everbright Bank Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans	1,454
China Minsheng Bank [Member]
Schedule of short term bank loans
Bank loans	2,908	3,072
Bank of Communications [Member]
Schedule of short term bank loans
Bank loans	2,893	1,536
Industrial and Commercial Bank of China [Member]
Schedule of short term bank loans
Bank loans	14,540	21,504
Nanjing Bank [Member]
Schedule of short term bank loans
Bank loans	5,089	9,216
HSBC [Member]
Schedule of short term bank loans
Bank loans		2,402
Shanghai Pudong Development Bank [Member]
Schedule of short term bank loans
Bank loans	$ 2,613