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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Components of accrued liabilities        
Preferred stock dividends payable $ 2,901   $ 2,901  
Accrued compensation and related charges 2,508   3,440  
Payable in connection with NJJM Employees severance related to relocation 1,238      
Payable in connection with Decontamination of NJJM factory 549      
Accrued professional services 484   706  
Payable in connection with construction 427   2,912  
Advance from customers 395 $ 483 476  
Accrued income taxes 368   99  
Accrued product warranty 353   236  
Other personnel related costs 163   202  
Other tax payable 126   261  
Current portion of operating lease liabilities 121      
Accrual for sales refund liabilities 61   47  
Payable in connection with repurchase of subsidiaries shares 151   1,147  
Deferred government grant income in connection with purchase of land     1,000  
Dividends payable by consolidated joint ventures 0   504 $ 524
Other accrued liabilities 1,100   1,440  
Accrued liabilities, Total $ 10,945   $ 15,371