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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Components of accrued liabilities [Abstract]        
Preferred stock dividends payable $ 2,901   $ 2,901  
Accrued compensation and related charges 2,570   3,205  
Payable in connection with purchase of subsidiary shares 1,192      
Advance from customers 648 $ 927 924  
Accrued professional services 618   583  
Dividends payable by consolidated joint ventures 505   533 $ 521
Other tax payable 352   395  
Accrued income taxes 260   270  
Accrued product warranty 228   133  
Other personnel related costs 227   230  
Current portion of royalty payments 144   575  
Accrual for sales refund liabilities 37      
Other accrued liabilities 3,094   1,400  
Accrued liabilities, total $ 12,776   $ 11,149