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ACCRUED EXPENSES AND OTHER LIABILITIES - Summary of accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ACCRUED EXPENSES AND OTHER LIABILITIES    
Accrued payroll and related expenses $ 2,060 $ 1,935
Accrued sales incentives and discounts 3,309 2,671
Accrued warranty costs 3,405 3,836
Deferred revenue 721 706
Other 622 483
Total accrued expenses and other liabilities $ 10,117 $ 9,631