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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, 2016
Dec. 31, 2015
Warranty Liability    
Obligation to specific customer causing warranty liabilities decrease   $ 371
Changes in the carrying amount of the total product warranty liability    
Balance, beginning of period $ 601 1,054
Addition to (reduction of) warranty reserve 83 (72)
Warranty claims (13) (381)
Balance, end of period $ 671 $ 601
Minimum    
Warranty Liability    
Term of warranty 1 year  
Maximum    
Warranty Liability    
Term of warranty 5 years