REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Disaggregated Revenue [Line Items]
Revenue	$ 161,142	$ 115,095
Telecom
Disaggregated Revenue [Line Items]
Revenue	65,824	66,323
E-commerce & Consumer
Disaggregated Revenue [Line Items]
Revenue	24,344	8,113
Financial & Business Services
Disaggregated Revenue [Line Items]
Revenue	13,320	15,264
Media & Cable
Disaggregated Revenue [Line Items]
Revenue	21,757	3,317
Travel & Hospitality
Disaggregated Revenue [Line Items]
Revenue	16,514	13,641
Healthcare & Education
Disaggregated Revenue [Line Items]
Revenue	10,529	2,630
Energy, Power & utility
Disaggregated Revenue [Line Items]
Revenue	2,485	3,016
All other segments
Disaggregated Revenue [Line Items]
Revenue	$ 6,369	$ 2,791

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration