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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]      
Accrued payroll and related benefits $ 522 $ 1,243  
Accrued sales commissions and incentives 325 1,005  
Accrued warranty expense 331 314 $ 81
Accrued severance 328 96  
Accrued legal and professional fees 63 151  
Accrued other expenses 107 108  
Total accrued liabilities $ 1,676 $ 2,917