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SHORT-TERM BORROWINGS (Details) ¥ in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 CNY (¥)	Dec. 31, 2018 USD ($)
Short-Term Borrowings [Abstract]
Short-term borrowings	$ 15,665		$ 15,665			$ 9,447
Interest expense related to short-term borrowings	205	$ 112	538	$ 364
Line of Credit Due on April 17, 2019 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	0		$ 0			3,133
Maximum borrowing capacity | ¥					¥ 50,000
Annual interest rate			4.99%
Line of credit due date			Apr. 17, 2019
Line of Credit Due on February 14, 2019 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	0		$ 0			485
Maximum borrowing capacity | ¥					50,000
Annual interest rate			5.15%
Line of credit due date			Feb. 14, 2019
Line of Credit Due on January 23, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	7,041		$ 7,041			0
Maximum borrowing capacity | ¥					50,000
Annual interest rate			5.22%
Line of credit due date			Jan. 23, 2020
Line of Credit Due on June 6, 2019 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	0		$ 0			2,186
Maximum borrowing capacity | ¥					30,000
Annual interest rate			5.22%
Line of credit due date			Jun. 06, 2019
Line of Credit Due on June 13, 2019 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	0		$ 0			2,186
Maximum borrowing capacity | ¥					30,000
Annual interest rate			5.22%
Line of credit due date			Jun. 13, 2019
Line of Credit Due on January 23, 2019 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	0		$ 0			1,457
Maximum borrowing capacity | ¥					10,000
Annual interest rate			5.44%
Line of credit due date			Jan. 23, 2019
Line of Credit Due on February 21, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	1,414		$ 1,414			0
Maximum borrowing capacity | ¥					20,000
Annual interest rate			5.66%
Line of credit due date			Feb. 21, 2020
Line of Credit Due on January 18, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	1,414		$ 1,414			0
Maximum borrowing capacity | ¥					20,000
Annual interest rate			5.66%
Line of credit due date			Jan. 18, 2020
Line of Credit Due on January 22, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	707		$ 707			0
Maximum borrowing capacity | ¥					20,000
Annual interest rate			5.66%
Line of credit due date			Jan. 22, 2020
Line of Credit Due on February 14, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	707		$ 707			0
Maximum borrowing capacity | ¥					20,000
Annual interest rate			5.66%
Line of credit due date			Feb. 14, 2020
Line of Credit Due on March 25, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	3,252		$ 3,252			0
Maximum borrowing capacity | ¥					50,000
Annual interest rate			4.94%
Line of credit due date			Mar. 25, 2020
Line of Credit Due on April 17, 2020 [Member]
Short-Term Borrowings [Abstract]
Short-term borrowings	$ 1,130		$ 1,130			$ 0
Maximum borrowing capacity | ¥					¥ 50,000
Annual interest rate			5.66%
Line of credit due date			Apr. 17, 2020

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