REVENUE FROM SERVICES - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from services	$ 15,003	$ 69,009
Turnkey
Disaggregation of Revenue [Line Items]
Revenue from services	12,903	61,159
Term
Disaggregation of Revenue [Line Items]
Revenue from services	2,100	7,850
North America
Disaggregation of Revenue [Line Items]
Revenue from services	12,556	44,995
North America | Turnkey
Disaggregation of Revenue [Line Items]
Revenue from services	10,779	37,468
North America | Term
Disaggregation of Revenue [Line Items]
Revenue from services	1,777	7,527
South America
Disaggregation of Revenue [Line Items]
Revenue from services	1,525	23,092
South America | Turnkey
Disaggregation of Revenue [Line Items]
Revenue from services	1,224	22,791
South America | Term
Disaggregation of Revenue [Line Items]
Revenue from services	301	301
Southeast Asia
Disaggregation of Revenue [Line Items]
Revenue from services	714	714
Southeast Asia | Turnkey
Disaggregation of Revenue [Line Items]
Revenue from services	692	692
Southeast Asia | Term
Disaggregation of Revenue [Line Items]
Revenue from services	22	22
Other
Disaggregation of Revenue [Line Items]
Revenue from services	208	208
Other | Turnkey
Disaggregation of Revenue [Line Items]
Revenue from services	208	208
Other | Term
Disaggregation of Revenue [Line Items]
Revenue from services	$ 0	$ 0