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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Components of accrued liabilities      
Preferred stock dividends payable $ 2,901 $ 2,901  
Accrued compensation and related charges 1,899 3,440  
Payable in connection with repurchase of subsidiaries shares 1,176 1,147  
Payable in connection with construction 540 2,912  
Advance from customers 483 476  
Accrued professional services 351 706  
Accrued product warranty 325 236  
Other tax payable 307 261  
Other personnel related costs 196 202  
Current portion of operating lease liabilities 118    
Accrued income taxes 88 99  
Accrual for sales refund liabilities 60 47  
Deferred government grant income in connection with purchase of land   1,000  
Dividends payable by consolidated joint ventures 0 504 $ 552
Other accrued liabilities 1,112 1,440  
Accrued liabilities, Total $ 9,556 $ 15,371