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Business Combination Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Feb. 28, 2017
Assets:      
Goodwill $ 4,696 $ 4,696  
Spill Magic      
Assets:      
Accounts receivable     $ 684
Inventory     453
Equipment     296
Intangible assets     5,066
Goodwill     748
Total assets     $ 7,247