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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)
9 Months Ended
Sep. 14, 2018
Dec. 31, 2018
Mar. 31, 2018
Nov. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration     $ 5,464,000  
Fair value, measurements, recurring        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent purchase consideration, change in fair value of contingent consideration   $ 102,000    
Contingent consideration, change in fair value of contingent consideration   64,000    
Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration     5,464,000  
Simena        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration       $ 8,000,000
Simena | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration     4,900,000  
Efflux        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration     523,000  
Efflux | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Estimated fair value of contingent purchase consideration     $ 523,000  
HNT tools business | Disposed of by Sale        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent consideration related to the divestiture $ 2,300,000 $ 2,300,000    
Contingent consideration related to the divestiture, measurement period 2 years      
HNT tools business | Disposed of by Sale | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Contingent consideration related to the divestiture $ 4,000,000.0