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Basis of Presentation and Summary of Significant Accounting Policies - Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Balance at beginning of period $ 239 $ 240 $ 227 $ 195
Warranty accruals for current period sales 22 0 39 7
Adjustments to existing warranties (2) (25) 12 19
In kind settlements made during the period (20) 0 (39) (6)
Accrued warranty reserve at end of period $ 239 $ 215 $ 239 $ 215