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REVENUE FROM CONTRACTS WITH CUSTOMERS - Timing of Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue $ 6,481 $ 4,922
Products and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Revenue 3,273 2,267
Products and services transferred over time    
Disaggregation of Revenue [Line Items]    
Revenue $ 3,208 $ 2,655