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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Warranty Liability - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
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 (350) (28)
Warranty claims (5) (62)
Balance, end of period $ 226 $ 581
Minimum    
Warranty Liability    
Term of warranty 1 year  
Maximum    
Warranty Liability    
Term of warranty 5 years