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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Components of accrued liabilities [Abstract]      
Preferred stock dividends payable $ 2,901 $ 2,901  
Accrued compensation and related charges 1,622 2,610  
Current portion of royalty payments 575 575  
Dividends payable by consolidated joint ventures 503 499 $ 552
Accrued professional services 243 583  
Accrued income taxes 212 203  
Accrued product warranty 133 251  
Other accrued liabilities 1,717 1,638  
Accrued liabilities, total $ 7,906 $ 9,260