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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Changes in the carrying amount of the total product warranty liability      
Balance, beginning of period $ 581 $ 671  
Addition to (reduction of) warranty reserve 15 (89)  
Warranty claims (3) 10  
Balance, end of period 593 592  
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of period 225 145  
(Recoveries) bad debt expense (12) 48  
Write-offs (13)    
Balance at end of period 200 $ 193  
Liquidated Damages      
Reserve for liquidated damages 0    
Workers' Compensation Reserves      
Amount accrued for self-insured workers' compensation claims $ 493   $ 812
Minimum      
Warranty Liability      
Term of warranty 1 year    
Maximum      
Warranty Liability      
Term of warranty 5 years