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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Losses incurred on valuation of inventory and write-off of obsolete inventory $ 496 $ 946
Deferred cost of goods sold 1,628 1,698
Current:    
Raw materials 2,735 3,056
Finished goods 10,712 9,710
Inventories 13,447 12,766
Long-term:    
Raw materials 375 59
Finished goods 1,643 817
Inventories, long-term $ 2,018 $ 876