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BASIS OF PRESENTATION - Timing of Revenue Recognition (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Revenue $ 5,186
Products and services transferred at a point in time  
Disaggregation of Revenue [Line Items]  
Revenue 2,351
Products and services transferred over time  
Disaggregation of Revenue [Line Items]  
Revenue $ 2,835