Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses - Schedule of Accrued Expenses (Details)

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]      
Compensation and related benefits $ 702 $ 236  
Accrued warranty (Note 7) 50 87 $ 97
Accrued IPO costs 680    
Other accrued expenses 208 1  
Accrued expenses $ 1,640 $ 324