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Merger with Cooltech - Summary of Net Assets Acquired in Transaction (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 12, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 15,469   $ 5,936
Cooltech Holding Corp. ("Cooltech") [Member]      
Business Acquisition [Line Items]      
Cash   $ 1,264  
Private placement proceeds   1,750  
Accounts receivable   2,692  
Inventory   3,190  
Prepaid assets   1,454  
Fixed assets   58  
Goodwill   3,343  
Other assets   28  
Accounts payable   (2,744)  
Accrued expenses   (2,396)  
Long-term convertible debt   (735)  
Total net assets acquired   $ 7,904