v3.10.0.1
Accrued Warranty - Summary of Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Product Warranty Liability [Line Items]    
Balance at beginning of period $ 125 $ 338
Accrued warranty expense/(benefit) (24) 121
Warranty claims paid (35) (147)
Balance at end of period $ 66 $ 312
Minimum    
Product Warranty Liability [Line Items]    
Warrants period 1 year  
Maximum    
Product Warranty Liability [Line Items]    
Warrants period 5 years