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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of accrued liabilities [Abstract]      
Accrued compensation and related charges $ 3,205 $ 2,610  
Preferred stock dividends payable 2,901 2,901  
Advances from customers 924 238  
Current portion of royalty payments 575 575  
Accrued professional services 570 583  
Dividends payable by consolidated joint ventures 533 499 $ 534
Other tax payable 395 147  
Accrued income taxes 270 203  
Other personnel related costs 230 200  
Accrued product warranty 133 251 $ 497
Other accrued liabilities 1,413 1,053  
Accrued liabilities, total $ 11,149 $ 9,260