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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Components of accrued liabilities [Abstract]      
Preferred stock dividends payable $ 2,901 $ 2,901  
Accrued compensation and related charges 1,449 2,610  
Advances from customers 771 238  
Current portion of royalty payments 575 575  
Accrued professional services 541 583  
Dividends payable by consolidated joint ventures 521 499 $ 520
Accrued income taxes 330 203  
Accrued product warranty 138 251  
Other accrued liabilities 2,058 1,400  
Accrued liabilities, total $ 9,284 $ 9,260