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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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