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Summary of Significant Accounting Policies - Schedule of Warranty Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at the beginning of the year $ 174 $ 331
Accruals for warranties issued 51 196
Adjustments to existing warranties 103 (87)
Settlements made during the year (in kind) (70) (266)
Accrued warranty expense $ 258 $ 174