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FAIR VALUE MEASUREMENTS - The Group's financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Marketable securities		$ 0
Fair Value, Measurements, Recurring [Member]
Marketable securities	$ 19,602
Financial liabilities related to foreign currency derivative hedging contracts	(293)
Earn out liability related to the acquisition of ACS	(433)
Total financial net assets (liabilities)	18,876
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Marketable securities	19,602
Financial liabilities related to foreign currency derivative hedging contracts	(293)
Total financial net assets (liabilities)	19,309
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Earn out liability related to the acquisition of ACS	(433)
Total financial net assets (liabilities)	$ (433)

X

- Definition

It represents amount of financial assets liabilities fair value disclosure.

+ References

No definition available.

+ Details

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X

- Definition

Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

Fair value as of the balance sheet date of all derivative liabilities designated as foreign currency fair value hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Amount of investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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