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ACCRUED EXPENSES AND OTHER LIABILITIES - Summary of accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
ACCRUED EXPENSES AND OTHER LIABILITIES    
Accrued payroll and related expenses $ 2,381 $ 2,060
Accrued sales incentives and discounts 4,155 3,309
Accrued warranty costs 4,629 3,405
Deferred revenue 416 721
Other 658 622
Total accrued expenses and other liabilities $ 12,239 $ 10,117