Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary of other expenses due to related parties
Total	$ 57	$ 65	$ 132	$ 136
Chuzhou Huarui [Member]
Summary of other expenses due to related parties
Total	35	51	88	109
Kunshan Enjin [Member]
Summary of other expenses due to related parties
Total	$ 22	$ 14	$ 44	$ 27